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The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is

A. 200 meter

B. 225 meter

C. 245 meter

D. 250 meter

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Correct Answer : C.

S p e e d = (45 x \frac{5}{18}) m / s e c = (\frac{25}{2}) m / s e c . T i m e = 30 s e c . L e t t h e l e n g t h o f b r i d g e b e x m e t r e s . T h e n, \frac{130 + x}{30} = \frac{25}{2} \Rightarrow 2 (130 + x) = 750 \Rightarrow x = 245 m e t e r

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