Two identical trains A and B running in opposite directions at same speed take 2 min to cross each other completely. The num. of bogies of A are increased from 12 to 16. How much more time would they now require crossing each other?

Options
- 40
- 50
- 60
- 20

CORRECT ANSWER : 20

Discussion Board
Solution

Two identical trains will have same number of bogies i.e., 12 each
Then no of bogies to be crossed by either ends of the trains is 24
Given time is 2 mins
Then the relative speed of the trains = 12 bogies per 60 seconds
= 1 bogie per 5 seconds
When bogies of train A increased by 4
It will take 4*5 = 20 more seconds to cross each other.


Ganesh Banoth 09-3-2021 04:05 PM

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