A train running at a speed of 45 km/hr takes 10 seconds to pass a certain point. Then the length of the train is

120 m

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125 m

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128 m

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450 m

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Solution

The correct option is B 125 m
$S p e e d o f t h e t r a i n = \frac{45 \times 1000}{60 \times 60} = \frac{25}{2} ㎧$
Time taken to cross the pole=10 seconds
$L e n g t h o f t h e t r a i n = \frac{25}{2} \times 10 = 125 m$

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