Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 22)
22.
Two goods train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km/hr and 30 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one.
Answer: Option
Explanation:
| Relative speed = | = (45 + 30) km/hr | |||||||
|
||||||||
|
We have to find the time taken by the slower train to pass the DRIVER of the faster train and not the complete train.
So, distance covered = Length of the slower train.
Therefore, Distance covered = 500 m.
 Required time = |
 |
500 x | 6 |  |
= 24 sec. |
| 125 |
Discussion:
81 comments Page 2 of 9.
Sahil said:
5 years ago
Can someone explain why they reversed the distance in the final calculation (i.e 125/6 to 6/125)?
(1)
Jimmy said:
5 years ago
No @Vaidya,
24 is the right answer. Try to understand the question and then emulate the trains with two pens or pencils. You will realise that the question is asking about time taken to cover the length of only one train, not both.
24 is the right answer. Try to understand the question and then emulate the trains with two pens or pencils. You will realise that the question is asking about time taken to cover the length of only one train, not both.
Vaidya said:
5 years ago
Answer should be 48.
(7)
Karma said:
5 years ago
Won't the driver be facing each other at the start? Hence time taken is 0. They are already facing each other or at the same spot at start of the problem.
(2)
Dhanraj said:
6 years ago
No, it is not 48 sec, Check It's mentioned to find the time to cross the fast train driver, so consider this as point or pole example and solve using the length of a single train.
(2)
Reho Rex said:
6 years ago
This is the trick part of question no.14.
Ankit gohel said:
6 years ago
If speed equals then what? Please tell me.
Ruturaj said:
6 years ago
Not getting this, Please anyone explain it clearly.
Muqeet said:
6 years ago
Here it states to cross the driver, not cross the train.
So, please explain in detail.
So, please explain in detail.
(1)
Jay said:
6 years ago
500 should be the initial distance between two trains.
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