Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 26)
26.
Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?
Answer: Option
Explanation:
| Relative speed = (40 - 20) km/hr = |  |
20 x | 5 |  |
m/sec = | |
50 | |
m/sec. |
| 18 | 9 |
 Length of faster train = |
|
50 | x 5 | |
m = | 250 | m = 27 | 7 | m. |
| 9 | 9 | 9 |
Discussion:
72 comments Page 2 of 8.
A Dwivedi said:
5 years ago
This question definitely depends upon where the person is sitting in the second train - middle, end or int engine of the train depending on which the total time taken by the fast train to pass him completely will change. And the solution given is correct only if the person is sitting at the end of the slower train. Can someone explain this, please?
(1)
Chaitanyasri said:
9 years ago
Can anyone please explain how to calculate the length of slower train?
Vishnu said:
9 years ago
250/9 ==>we get.
Quotient = 27, Remainder = 7.
Then it will be in form quotient (remainder/divisor).
ie, 27 7/9.
Quotient = 27, Remainder = 7.
Then it will be in form quotient (remainder/divisor).
ie, 27 7/9.
Salman khan said:
9 years ago
The thing is that when we find the relative speed, it means how their respective speeds change their positions and how their distance is varying, so with the help of the relative speed and the 5 second time which is the crossing time, for the tenure of 5 seconds we can find the length of the fastest train.
Azim said:
9 years ago
Consider the slower train as a man.
Swati said:
8 years ago
Why do we ignore the length of the slower train, Is it because the place where the man is sitting is not fixed?
Hrushi said:
8 years ago
Please explain clearly. Why we ignore the length of the slow train?
Nilesh z. said:
8 years ago
Just consider that man is moving at 20 km/hr. Now solve the problem as you solved problem number 27 by considering just one man. You will come to know why we don't consider the length of the slower train.
Deepak rawat said:
9 years ago
How to convert 250/9 to mixed fraction? Please explain.
Priyansh patidar said:
8 years ago
50/9 = x/5,
X=250/9,
X=27 7/9.
X=250/9,
X=27 7/9.
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