Find the time taken by 150 m long train to pass through a bridge which is 100 m long,running at a speed of 72km/hr.

12.5s

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11s

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18.5s

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16s

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Solution

The correct option is A
12.5s

Given,

Length of the train = 150m

Length of the bridge= 100m

Speed of train = 72km/hr = $72 \times \frac{5}{18} = 20 m / s$

In order to cross the bridge,the train travels a total distance of $(150 + 100) = 250 m$

Thus, $s p e e d = \frac{d i s t a n c e}{t i m e} = \frac{250}{20} = 12.5 s$

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110

72 k m /

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