Two trains, each 50m long are moving parallel towards each other at speeds 10m/s and 15m/s respectively. How much time will they take to pass each other?
A
8s
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B
4s
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C
2s
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D
6s
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Solution
The correct option is B 4s Velocity of train 1 =15m/s
Velocity of train 2 =−10m/s (∵ It is moving in opposite direction to that of train 1)
Let Vr be the relative velocity of the train 1 w.r.t train 2 ⇒Vr=25m/s
Distance travelled by both trains to cross each other is given by d=50m+50m d=100m ∴ Time after which they will pass each other =dVr=10025=4s