Discussion

Question:

A man on a platform notices that a train going in one direction takes 10 seconds to pass him and a train of the same length going in the other direction takes 15 seconds to pass him. If the length of the train is 600 m each, what is the time taken by the two trains to pass one another?

Explanation:

Speed of train 1 = 600/10 = 60 m/s

Speed of train 2 = 600/15 = 40 m/s

Since they travel in opposite direction,

Therefore, relative speed = 60 + 40 = 100 m/s

Now, time taken to cross each other = $\frac{L e n g t h o f t r a i n 1 + L e n g t h o f t r a i n 2}{R e l a t i v e s p e e d}$ = $\frac{600 + 600}{100}$ = 12 secs

Thus, time taken by the two trains to pass one another is 12 seconds.

Hence, option (d).

» Your doubt will be displayed only after approval.

Discussion

Doubts

Feedback