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Q.

A passenger sitting in a train A moving at 90 km/h observes another train B moving in the opposite direction for 8 s. If the velocity of the train B is 54 km/h, then length of train B is:

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a

320m

b

120m

c

80m

d

200m

answer is C.

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Detailed Solution

detailed_solution_thumbnail

Vrelative = (90 + 54)
= 144 km/h
= 144 x 5/18 m/s
= 40 m/s
length of train = Vrelative x time
= 40 x 8
= 320m

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A passenger sitting in a train A moving at 90 km/h observes another train B moving in the opposite direction for 8 s. If the velocity of the train B is 54 km/h, then length of train B is: