Question

two trains 121 m and 99m in length are running in opposite directions with velocities 40km/h and 32km/h. in what time they will completely cross each other

Answer 1

Total distance covered to cross each other = 121 + 99 = 220 m

Net speed (as running opposite) = 40 + 32

= 72 kmph = 72 ×5/18 = 20 m/s

So, time taken = 220/20 = 11 second

So, it will take 11 seconds to cross each other.

Answer 2

__________t = 11 sec___________

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Hope it helps...

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