Two trains of equal length, running in opposite directions, pass a pole in 24 and 12 seconds. The train will cross each other in -

Question: Two trains of equal length, running in opposite directions, pass a pole in 24 and 12 seconds. The train will cross each other in -

Solution:
Let the length of both train be x meters
Speed of the first train = x/24 m/s
and speed of the second train = x/12 m/s

When running in opposite directions, relative speed = x/24 + x/12
= 3x/24
= x/8

To cross each other, distance to be covered = x + x = 2x meters

Taken taken = (2x)/(x/8) = 16 sec