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A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

A. 40 sec

B. 42 sec

C. 45 sec

D. 48 sec

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Correct Answer : A.

F o r m u l a f o r c o n v e r t i n g f r o m k m / h r t o m / s : X k m / h r = (X \times \frac{5}{18}) m / s . T h e r e f o r e, S p e e d = (45 x \frac{5}{18}) m / s e c = \frac{25}{2} m / s e c . T o t a l d i s \tan c e t o b e c o v e r e d = (360 + 140) m = 500 m . F o r m u l a f o r f i n d i n g T i m e = (\frac{D i s \tan c e}{S p e e d}) ∴ R e q u i r e d t i m e = (\frac{500 x 2}{25}) s e c = 40 s e c .

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