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Train A and B of equal lengths of 120m are moving towards a 300 m long tunnel. Train B enters the tunnel after 30 seconds when train A entered the tunnel. Train A crosses the tunnel in one minute. If both of them leave the tunnel at the same time, then what is the speed of train B?

Train A and B of equal lengths of 120m are moving towards a 300 m long tunnel. Train B enters the tunnel after 30 seconds when train A entered the tunnel. Train A crosses the tunnel in one minute. If both of them leave the tunnel at the same time, then what is the speed of train B? Correct Answer 14 m/s

If train B enters the tunnel 30 seconds later and train A takes one minute to cross the tunnel, this implies that train B takes 30 seconds to cross the tunnel as both the trains leave the tunnel at the same time.

Distance covered by train B = length of train + length of the tunnel = 120 + 300 = 420 m

Thus, speed = (Distance covered)/(Time taken)

∴ Speed of train B = 420/30 = 14 m/s

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