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A bridge is $400 m$ long. A $150 m$ long train crosses the bridge at a speed of $50 m / s$ . Time taken by the train to cross it is:

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6 s

8 s

11 s

5 s

answer is C.

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Detailed Solution

A bridge is

400 m

long. A

150 m

long train crosses the bridge at a speed of

50 m / s

. Time taken by the train to cross it is

11 s

.
For the whole train to cross the bridge, we need to add the length of the train to the length of the bridge.
So, Total distance to be travelled

= 400 + 150

= 550 m

Speed of train

= 50 m / s

Time

= \frac{Distance}{Speed}

= \frac{550}{50}

= 11 s

Hence, Time taken by the train to cross the bridge is

11 s

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