The answer is simple. We are converting the 'kilo-meters/hour' value into 'meters/second'.
Let me explain about converting km/hr into m/s in detail.
1 km = 1000 meters.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s
= 10/36 m/s
= 5/18 m/s.
Therefore 1 km/hr = 5/18 m/sec.
Similarly 60 km/hr = 60 x 5/18 m/sec.
You may ask me, why should I convert it from km/hr to m/sec?
Because, the time taken by the train is given in terms of seconds (9 seconds) and the 4 options are in terms of metres. But the speed of the train is given in terms of km/hr. So we have to convert the values from km/hr to m/s in order to find the solution in terms of metres/seconds.
Hope you understand better. Have a nice day guys!
Karthick said:
(Thu, Jul 29, 2010 05:17:32 PM)
Nice explanation for beginners.
Dhesappan said:
(Mon, Sep 27, 2010 06:16:53 AM)
Any one know the how many feet is one meter?
Sundar said:
(Mon, Sep 27, 2010 08:43:50 AM)
Feet to Meter conversion: 1 feet = 0.3048 meter
Meter to Feet conversion: 1 meter = 3.28083 feet
Jain Thomas said:
(Fri, Nov 12, 2010 07:33:40 AM)
Hi Sundar,
That was a damn good explanation
Rita said:
(Fri, Nov 12, 2010 08:54:06 AM)
Very well explained Sundar. Thanks a lot for helping us with your valuable explanation
Kalimuthu said:
(Wed, Nov 24, 2010 01:09:09 AM)
1000m=1km so 60000m goes in 1hour.
1 hour=3600 sec so 60000/3600 =16.666 so train cross in 1 second is 16.666m...so 9 seconds 16.6666*9=150meter .
B.V.S.Sharma said:
(Sat, Dec 4, 2010 08:48:54 AM)
60*5/18*9=150 m...
Parashuram said:
(Fri, Dec 10, 2010 07:34:38 AM)
How to calculate 16*5/18*9?
V.Navin Kumar said:
(Thu, Dec 16, 2010 09:17:23 AM)
Nice to learn fast.
Naveen said:
(Thu, Dec 30, 2010 12:33:56 AM)
@B.V.S.Sharma
60*(5/18)*9=150 m...
Poonam said:
(Sun, Jan 2, 2011 09:19:45 AM)
No need of MBA & MCA coaching classes. Thank you.
Pooja said:
(Sun, Jan 2, 2011 09:22:20 AM)
Hi.Thank you for guiding students for MCA & MBA...
Sunny said:
(Fri, Jan 7, 2011 12:43:53 AM)
Great Job Sundar and Naveen.Thank You.
Vishnu said:
(Sat, Jan 15, 2011 10:53:29 AM)
Do any one know the relationship betwen miles and kilometers?
Sudhakar said:
(Tue, Jan 18, 2011 03:20:28 AM)
It's useful to science students,and every student know the how to change the units.
so thankyou very much sir.
Sudhakar said:
(Tue, Jan 18, 2011 03:41:30 AM)
It's is very nice process to do this problem.
Prakash said:
(Sun, Jan 23, 2011 02:11:58 AM)
v=d/t means
velocity=distance/time
Gokulnath said:
(Sun, Jan 30, 2011 04:42:42 AM)
Why se converting m/sec into km/sec?
Sairaj said:
(Thu, Feb 3, 2011 08:46:03 AM)
1 mile=1.61 km
Hanumantha Reddy said:
(Fri, Feb 4, 2011 11:54:28 PM)
Hi good morning this problem am not understand please explain me.
Reddy said:
(Fri, Feb 4, 2011 11:57:39 PM)
@Rita
Please explain this problem I am not understand.
Soundhar said:
(Sun, Feb 20, 2011 12:31:40 AM)
Let length of the train be 'x' metres...
Speed of the train = 60km/hr(given)
Time = 9seconds(given)
refer the formulas for train problems...
As the time is given in seconds and answers are given in metre(train length) we are in need to convert from km/hr to m/s
km/hr = 1000m/(60min*60sec) = 5/18 m/s
Length of the train(distance covered a post)= speed * time
= (60*(5/18))*9
= (50/3)*9
= 150 m
For the train related formulas,check the READ MORE in Left corner(Important formulas)...
Contactjerin said:
(Thu, Mar 3, 2011 03:34:20 PM)
Any one know the how many feet is one meter?
Sundar said:
(Thu, Mar 3, 2011 11:50:57 PM)
@Contactjerin
Feet to Meter conversion: 1 feet = 0.3048 meter
Meter to Feet conversion: 1 meter = 3.28083 feet
This is what I mentioned already in this discussion.
You can easily find the answer for your question that is:
3.28083 feet = 1 meter.
Suganthan.M said:
(Sat, Mar 12, 2011 02:33:05 AM)
From the question we can predict speed= distance/hour
((by speed=60 km/hr)note the km/hr)
As to calculate for 9 sec I am converting the whole things to seconds
(i.e.)speed=60000/3600=16.666666(remember this is for one second)
I'M UNDERSTAND SIR BUT I'm suppose to be confusing to seeing above following questions so I'm kindly requesting you to explain the solutions above question, thank you.
Umesh said:
(Mon, Apr 4, 2011 11:54:41 AM)
Hi Kalimuthu great explanation.
Palanivel said:
(Mon, Apr 25, 2011 02:15:30 AM)
Hi i am palanivel i got ur explanation for above question..thak you..
Joseph said:
(Wed, Apr 27, 2011 10:59:34 PM)
First convert the km into metres 60km will bcome 60000 metres then divide 60000 with 1 hour that is 60,60000/60 this will give us the speed of the train in mins n then 1000 with 60(to convert the speed in seconds)then multiply the ans with 9 seconds.ie 16.66*9 will give us 150 :)
Joshna said:
(Tue, May 17, 2011 06:18:44 AM)
Hi this is joshna. Got your explanation. Tanq.
Nagaraju said:
(Wed, May 18, 2011 12:58:01 PM)
Here we have to think that they are asking the length of train.
First we have conform that all the values given are same format or not .
if not we have to convert them into one format depending on the answers given to us.
Then it is possible to get the correct answer.
The first answer explanation by Sundar is very good .
Aradhana said:
(Sun, May 29, 2011 07:53:25 AM)
The first answer which was given by sunder is best, even a kid can understand it well, well done sunder.
Dheeraj said:
(Sun, May 29, 2011 01:37:55 PM)
Nice trick.
Sekhar said:
(Thu, Jun 9, 2011 09:33:40 AM)
The first answer is the best answer
Ashwini said:
(Fri, Jul 15, 2011 06:43:56 AM)
@ Kalimuthu Thanks...I understand your solution.
Geeth said:
(Wed, Aug 3, 2011 03:20:46 PM)
Just now I know the formula for converting meter to feet. Thank you.
Sundar.
Sridhar said:
(Wed, Aug 10, 2011 02:16:28 PM)
Can any one say me about pole in this question?
Aditya said:
(Sat, Aug 20, 2011 03:52:28 PM)
Sonali invests 15% of her monthly salary in insurance policies. She spends 55% of her monthly salary in shopping and on household expenses. She saves the remaining amount of Rs. 12,750. What is Sonali's monthly income?
Sundar said:
(Wed, Aug 24, 2011 01:05:35 PM)
Q. Sonali invests 15% of her monthly salary in insurance policies. She spends 55% of her monthly salary in shopping and on household expenses. She saves the remaining amount of Rs. 12,750. What is Sonali's monthly income?
Solution:
Let the monthly-salary be X.
Total %-of-amount spent = (15 + 55) = 70% of X.
Remaining amount saved is 30% of X.
Now, 30% of X = 12750. Then 100% of X = ?
X = (12750/30) x 100 = 42,500.
Required answer X = Rs. 42,500. //
Note:-
Amount Spent in Insurance (15% of X) = (15/100) x 42500 = Rs. 6,375.
Amount Spent in Shopping (55% of X) = (55/100) x 42500 = Rs. 23,375.
Amount Saved (30% of X) = (30/100) x 42500 = Rs. 12,750.
Lets take mnthy salry to be x;
then ,
x-15x/100+55x/100=12750;
x-14x/20=12750;
6x/20=12750;
x=(12750)20/6
x=42,5000;
monthly salry is Rs.42,500
Edger said:
(Mon, Sep 12, 2011 10:56:03 PM)
60*5/18 = how to calculate this logic, but I'm clear next step --50/3*9=150---guys please explan this.
Hifzur said:
(Wed, Sep 14, 2011 08:31:16 PM)
Its simple no need of going that 5/18 it wil give confusion.
Convert 60 km into meter i.e 60000m.
Now speed is 60000m/hr... convert it into per second.
i.e 60000/(60*60)=16.66
As we know length=(speed*time)
:.16.66*9 = 150.
Roshan Machhi said:
(Wed, Oct 19, 2011 08:25:55 PM)
I understand it but just explain in detail.
Ghanshyam said:
(Fri, Oct 21, 2011 06:07:57 PM)
Nice explanation in detail. Thank you very much.
Sara said:
(Sat, Oct 22, 2011 07:03:45 AM)
Distance = Time *speed
1km =1000Meteres
1hr =3600 seconds
Distance = 60*9/3600 =9/60 km
Distane in Metres =(9/60)*1000 =150M
simple and fast way
Fuzail Ahmad said:
(Sat, Nov 12, 2011 09:41:33 PM)
Very good to all.
Jayakumar said:
(Sun, Nov 13, 2011 08:09:23 PM)
Jayanthi, Sundar, Kalimuthu Thanks for a lot to YOU all
I can easily understand your problem solving system and it is not only useful to me but also to all thanks thanks thanks thanks thanks
Baskar said:
(Thu, Nov 17, 2011 04:24:44 PM)
Any one know the how many feet is one meter? well explanations sundar.
Ajay said:
(Mon, Nov 21, 2011 10:01:10 AM)
Guy's why we multiply (speed x time) to find length.
train is going with 50/3 meter in one second,
suppose this train passes this pole in 1 second then train length would be 50/3 meter. (because 50/3 meter is covered by 1 second)
now suppose this train passes this pole in 2 second then train length would be (50/3)x 2 meter
now here train passes this pole in 9 second so the train length would be (50/3) x 9 = 150 meter
Vikram said:
(Thu, Nov 24, 2011 11:19:27 AM)
Here,The Train speed =60km/1hr & That Train was crosses a one Pole in 9 Seconds.
So,Therefore we are converting Km into Meters And Hour into Seconds.....
i.e.,That train speed=60km/60Minute.
i.e.,that Train Speed=1km/1Minute.
and 1km=1000meters ,1Minute=60seconds.
So,The Train Length = 1Km/1Minute *9.
that means ,Length of Train=(1000/60)*9.
=150 Meters.
Raja said:
(Wed, Nov 30, 2011 10:42:44 AM)
What is the shortcut method to calculate gcf of numbers?
Thangaraj K. said:
(Thu, Dec 15, 2011 08:24:56 AM)
Answer = sec/speed*1000 (i.e. - multiplied with 1000 to convert to metres )
=9/60*1000 = 150m
Sai said:
(Sat, Dec 17, 2011 12:55:59 PM)
@SAI
Simply sperb
Suresh said:
(Sun, Dec 18, 2011 08:56:13 PM)
Imagine the pole as a car moving on the train(road) which has a distance of 150m. If the pole(car) takes 9 sec to complete 150m, then what is the speed?
m/sec