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:
626 comments Page 6 of 63.
Kenshika venistran said:
3 years ago
We know that 1 kilometre = 1000 meters and 1 hour = 3600 seconds.
Now, 1 km/h can also be written as 1000/3600: 1 (kilometre/hour) = 1000/3600 (meters/seconds).
So, this is the formula which is used to convert km/h to m/s.
On simplifying 1000/3600 further, we get 5/18.
Now, 1 km/h can also be written as 1000/3600: 1 (kilometre/hour) = 1000/3600 (meters/seconds).
So, this is the formula which is used to convert km/h to m/s.
On simplifying 1000/3600 further, we get 5/18.
(73)
Suganthan.m said:
2 decades ago
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)
therefore for 9 seconds
16.666666*9= 150
((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)
therefore for 9 seconds
16.666666*9= 150
Roko Meena said:
1 decade ago
By using unit logic we can solve this question easily in question (given unit are km, m, sec).
Length of train in meter.
So, 60 km/hr.
= 60*1000 m/1*3600 sec.
1 km = 1000 m and 1 hour = 3600 sec.
= 1000 m*9 sec/3600 sec.
Sec unit cancel so I find (meter) 150 m.
Length of train in meter.
So, 60 km/hr.
= 60*1000 m/1*3600 sec.
1 km = 1000 m and 1 hour = 3600 sec.
= 1000 m*9 sec/3600 sec.
Sec unit cancel so I find (meter) 150 m.
BIJAY said:
4 years ago
@All.
We know that;
Velocity = Distance/Time.
so we can write,
Distance = Velocity*Time.
= (16.66)*(9) meters [=> 60km/hr convert into meters = 60*5/18. = 16.66 meter/sec.].
= 150 meters. [ANS].
We know that;
Velocity = Distance/Time.
so we can write,
Distance = Velocity*Time.
= (16.66)*(9) meters [=> 60km/hr convert into meters = 60*5/18. = 16.66 meter/sec.].
= 150 meters. [ANS].
Kaustubh Kishor Salunkhe said:
1 year ago
@All Everyone,
For the people who asking how 5/18 came?
It is used to convert KMPH to MPS
Let me explain how and when to use it. The hint is in the Answers we can see 60 km/hr and answers in Meters.
If it's Vise Versa we will use 18/5 to get the answer in Kmph.
For the people who asking how 5/18 came?
It is used to convert KMPH to MPS
Let me explain how and when to use it. The hint is in the Answers we can see 60 km/hr and answers in Meters.
If it's Vise Versa we will use 18/5 to get the answer in Kmph.
(6)
Deepak said:
10 months ago
@All.
Here's my explanation:
1. You have to convert speed km/h into m/s.
And the formula to convert speed km/h into m/s is 60 x 5/18 (Note : 5/18 is a constant).
Speed = 16.67 m/s.
2. Distance = speed X time.
16.67 x 9 = 150m is the length of the train.
Here's my explanation:
1. You have to convert speed km/h into m/s.
And the formula to convert speed km/h into m/s is 60 x 5/18 (Note : 5/18 is a constant).
Speed = 16.67 m/s.
2. Distance = speed X time.
16.67 x 9 = 150m is the length of the train.
(18)
Satyapal khetlan said:
1 decade ago
Given: Train velocity = 60 km/hr;
It's mean that at 1 hr, traveled distance by train, is 60 km;
1 sec. travel distance = 60,000/(3600) m (1 hr = 3600 sec. & 1 km = 1000 m).
So, 9 sec " " = (100/6)*9 m.
= 150 m.
So, 150 m, should be correct answer;
It's mean that at 1 hr, traveled distance by train, is 60 km;
1 sec. travel distance = 60,000/(3600) m (1 hr = 3600 sec. & 1 km = 1000 m).
So, 9 sec " " = (100/6)*9 m.
= 150 m.
So, 150 m, should be correct answer;
Sundar said:
2 decades ago
@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.
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.
Harendra yadav said:
9 years ago
GIVEN:-
Speed of the train = 60 km/h.
Time = 9 sec.
Length of the train = ?
Formula : All lenth / time * 18/5 = speed.
Solution:-
All length/ time * 18/5 = 60,
?/9 * 18/5 =60,
? * 2/5 =60,
? * 1/5 = 30,
?*1 =30*5,
? = 150.
Answer :- 150 meter.
Speed of the train = 60 km/h.
Time = 9 sec.
Length of the train = ?
Formula : All lenth / time * 18/5 = speed.
Solution:-
All length/ time * 18/5 = 60,
?/9 * 18/5 =60,
? * 2/5 =60,
? * 1/5 = 30,
?*1 =30*5,
? = 150.
Answer :- 150 meter.
Agni said:
1 decade ago
Easy method.
60 km per hr.
1hr = 60 mins.
That means.
Per km = 60km/60mins = 1.
Per km 1 min.
Per km = 1000 meters.
Per min = 60 sec.
Train is running per second = 1000/60 = 16.666 mtrs.
Cross the pole in 9 second = 16.666*9 = 150 mtrs.
60 km per hr.
1hr = 60 mins.
That means.
Per km = 60km/60mins = 1.
Per km 1 min.
Per km = 1000 meters.
Per min = 60 sec.
Train is running per second = 1000/60 = 16.666 mtrs.
Cross the pole in 9 second = 16.666*9 = 150 mtrs.
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