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How many seconds will a 500 metre long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?

A. 25

B. 30

C. 40

D. 45

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Correct Answer :

B. 30

S p e e d o f t h e t r a i n r e l a t i v e t o m a n = (63 - 3) k m / h r = 60 k m / h r = (60 x \frac{5}{18}) m / s e c = \frac{50}{3} m / s e c . T h e r e f o r e T i m e t a k e n t o p a s s t h e m a n = (500 x \frac{3}{50}) s e c = 30 s e c .

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