A passenger sitting in a train A moving at 90 km h - 1 observes another train B moving in the opposite direction for 8 s . If the velocity of the train B is 54 km h - 1 , then length of train B is:

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Let the velocity of A be v A and the velocity of B be v B . The relative velocity is v → B A = v → B - v → A ⇒ v B A = 54 - ( - 90 ) = 144 km h - 1 ⇒ v B A = 40 m s - 1 Time = length v B A ⇒ length = 40 m s - 1 × 8 s = 320 m

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