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24.A 120 m long train is moving in a directionwith speed 20 m/s. A train B moving with30 m/s in the opposite direction and 130 mlong crosses the first train in a time.

Answer»

The total length of two trains = 120 m + 130 m = 250 m

The two trains will cover a distance of 250 m to totally cross each other.

The speed of the two trains in this problem must be added together.

VAB = VA + VB

VAB = 20 m/s + 30 m/s = 50 m/s

The total time = total distance / total speed

The total time = 250 m / 50 m/s = 5.0 seconds

The two trains will totally cross each other after 5.0 seconds.

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