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Relative Velocity

A 120 m long ...

Question

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

A

6 s

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B

36 s

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C

38 s

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D

None of these

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Solution

The correct option is D None of these
Total disatance=130+120=250 m.
Relative velocity=30-(-20)=50m/s.
Hence $t = \frac{250}{50} = 5 s$

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