Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 1)
1.
A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
Answer: Option
Explanation:
| Speed = |  |
60 x | 5 |  m/sec |
= | |
50 | m/sec. |
| 18 | 3 |
Length of the train = (Speed x Time).
 Length of the train = |
|
50 | x 9 | m = 150 m. |
| 3 |
Discussion:
608 comments Page 55 of 61.
Ashik said:
1 decade ago
Dear Friends.
The problem is really nice ans soothing. I solved it firstly but when I saw the solution, I confused to see the calculation. After a deep concern and explanation I think it really a nice explanation. Okay friends after that thank to Sundar for posting another problem and solution. Thank to Kartik, Dhessappan, Jain Thomas, Rita, Valimithu, Jayanthi, Vishnu, Poonm, poja, Sunny, Sara and others.
The problem is really nice ans soothing. I solved it firstly but when I saw the solution, I confused to see the calculation. After a deep concern and explanation I think it really a nice explanation. Okay friends after that thank to Sundar for posting another problem and solution. Thank to Kartik, Dhessappan, Jain Thomas, Rita, Valimithu, Jayanthi, Vishnu, Poonm, poja, Sunny, Sara and others.
Rakshith devraj said:
1 decade ago
Guys check this out. !
This comment is to make you understand conversion of km/hr to m/s by using easy method. ,
Observe carefully conversion of km/hr to m/s. ,
12*1=12.
12*2=24.
12*3=36.
12*4=48.
12*5=60.
For any number (which has to be converted to m/s from km/hr) coming as the result (r) of multiplication table of 12. , you can easily write it as (quotient*10) /3 m/s. ,
Example:- 60km/hr = 50/3 m/s.
This comment is to make you understand conversion of km/hr to m/s by using easy method. ,
Observe carefully conversion of km/hr to m/s. ,
12*1=12.
12*2=24.
12*3=36.
12*4=48.
12*5=60.
For any number (which has to be converted to m/s from km/hr) coming as the result (r) of multiplication table of 12. , you can easily write it as (quotient*10) /3 m/s. ,
Example:- 60km/hr = 50/3 m/s.
TALADA SANDEEP said:
1 decade ago
Since time is given in seconds , sure you have to convert velocity of train in units of m/sec
Since 1 km = 1000 m
and 1 hr =60 m = 60*60 sec,
According to question,speed 60 km/hr = 60 * (1000/3600) = 50/3 m/sec, time = 9 sec
We know that , distance=speed*time,
therefore length = (50/3)*9 =150 m.
Since 1 km = 1000 m
and 1 hr =60 m = 60*60 sec,
According to question,speed 60 km/hr = 60 * (1000/3600) = 50/3 m/sec, time = 9 sec
We know that , distance=speed*time,
therefore length = (50/3)*9 =150 m.
Kusuma said:
1 decade ago
In simple way,
time/time = length/length.
Here we convert the 1 hour into seconds and the given time is 9 seconds.
We convert the kilo meters into meters then we can easily solve it.
3600/9 = 6000/x.
X = 150m.
time/time = length/length.
Here we convert the 1 hour into seconds and the given time is 9 seconds.
We convert the kilo meters into meters then we can easily solve it.
3600/9 = 6000/x.
X = 150m.
Sandeep said:
1 decade ago
Firsst 60 km/sec need to be converted in to meter /second.
It could be by multiply by 60*5/18 and then it multiply by 9 secound and hence anse we get 150 meter.
It could be by multiply by 60*5/18 and then it multiply by 9 secound and hence anse we get 150 meter.
Lokesh said:
1 decade ago
Local Train Leaves from a station at an intervals of 15 mins at a speed of 16kmph. A man moving from oppsite direction meets the train at an interval of 12 min. find the speed of that man?
Satish said:
1 decade ago
Another simple way.
We have to find the length of the train (in mts).
Given in km/Hr ==> 5/18 mts/sec. (1).
Also given time to cross the post i.e. in Sec.
Multiply 1 & sec => (mts/sec) *sec ==mts (ur answer).
We have to find the length of the train (in mts).
Given in km/Hr ==> 5/18 mts/sec. (1).
Also given time to cross the post i.e. in Sec.
Multiply 1 & sec => (mts/sec) *sec ==mts (ur answer).
Sudharsan said:
1 decade ago
Let the length of the train be x.
3600/9=6000/x.
X=150m !
3600/9=6000/x.
X=150m !
Hitesh said:
1 decade ago
When I saw the explanation I was confused that why these gyes used 5/18 to multiply But now I got it. Thanks!
Gokul said:
1 decade ago
Really nice explanation.
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