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Two trains 200 m and 150 m long are running on parallel tracks at the speed of 40 kmph and 45 kmph respectively. In how much time will they cross each other, if they are running in the same direction?

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72 sec

132 sec

192 sec

252 sec

answer is D.

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Detailed Solution

The effective speed of the train $V e = 45 k m p h - 40 k m p h = 5 k m p h$

$T h e n V e = 5 \times \frac{5}{18} m / s = \frac{25}{18} M / \sec$

Then, total length of train in meter is L = 200 + 150 = 350 m

$L = V_{e} t$

$t = L / V_{e}$

$t = \frac{350}{25 / 18}$

$t = \frac{350 \times 18}{25} = 252 \sec .$

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