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.
Salman said:
8 years ago
The question focus on the fast train and the man sitting somewhere in the train.
Here we can consider the slow train as a man running with 20km/hr.
So now the question can be understood in this way as well:.
There is a train running at speed of 40km/hr and a man running with 20km/hr in the same direction of the train. Calculate the length of the train?
Now solve it. Hope now it will become easy for everyone.
Here we can consider the slow train as a man running with 20km/hr.
So now the question can be understood in this way as well:.
There is a train running at speed of 40km/hr and a man running with 20km/hr in the same direction of the train. Calculate the length of the train?
Now solve it. Hope now it will become easy for everyone.
(1)
Deepak rawat said:
9 years ago
How to convert 250/9 to mixed fraction? Please explain.
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.
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.
Azim said:
9 years ago
Consider the slower train as a man.
Swati said:
9 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:
9 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.
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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