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Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is

A. 50 m

B. 72 m

C. 80 m

D. 82 m

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Correct Answer : A.

L e t t h e l e n g t h o f e a c h t r a i n b e x m e t r e s . T h e n, d i s \tan c e c o v e r e d = 2 x m e t r e s . R e l a t i v e s p e e d = (46 - 36) k m / h r = (10 x \frac{5}{18}) m / s e c = (\frac{25}{9}) m / s e c ∴ \frac{2 x}{36} = \frac{25}{9} \Rightarrow 2 x = 100 \Rightarrow x = 50 .

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