How long does a train $110$ metres long running at the speed of $72 k m /$ hr take to cross a bridge $132$ metres in length ?

9.8

sec

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12.1

sec

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12.42

sec

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14.3

sec

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Solution

The correct option is B $12.1$ sec
The length of the train $= 110 m$

Speed of the train

$= 72 k m / h r$

$= 72 \times \frac{5}{18} = 20 m / s$

The length of the bridge $= 132 m$

Time taken by train to cross the bridge

$= \frac{110 + 132}{20}$

$= \frac{242}{20}$

$= 12.1 sec$

Hence, this is the answer.

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