8. Two trains ofhe same length but with different speeds pass a static

1.	8. Two trains ofhe same length but with different speeds pass a static pole in 5 seconds and 6 secondsrespectively. In what time will they cross each other when they are moving in the same directio(3) 1 min(4) 60 min(5) of theseis and q seconds
Answer» Length of the train = l meter. Speed of the two trains are l/5 and l/6. Total distance = 2l. In same direction Relative speed is (l/5 - l/6). = l/5 - l/6 = l/30. Required Time = Distance/Speed. = 2l/(l/30) = 60 seconds. Shortcut method: Formula = 2(Product of time taken)/Difference of time taken. = 2(6 * 5)/(6 - 5) = 2 * 30 = 60 seconds.

8. Two trains ofhe same length but with different speeds pass a static pole in 5 seconds and 6 secondsrespectively. In what time will they cross each other when they are moving in the same directio(3) 1 min(4) 60 min(5) of theseis and q seconds

Answer»

Length of the train = l meter.

Speed of the two trains are l/5 and l/6.

Total distance = 2l.

In same direction Relative speed is (l/5 - l/6).

= l/5 - l/6 = l/30.

Required Time = Distance/Speed.

= 2l/(l/30) = 60 seconds.

Shortcut method:

Formula = 2(Product of time taken)/Difference of time taken.

= 2(6 * 5)/(6 - 5) = 2 * 30 = 60 seconds.