Q. Train A is 250 m long and travels at a speed of 54 km/hr. If a car chases this train at a speed of 72 km/hr, then in how much time will the car cross the train?

50 sec

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100 sec

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7 sec

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75 sec

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Solution

The correct option is A 50 sec
$R e l a t i v e S p e e d = (72 - 54) = 18 k m / h r$

$= 18 \times 5 / 18 m / s = 5 m / s$

$T = D / S \to 250 / 5 = 50 s e c$

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