A 120 m long train is moving in a direction with speed 20 ms'1. A train B moving with 30 ms'1 in the opposite direction and 130 m long crosses the first train in a time

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A 120 m long train is moving in a direction with speed 20 ms'1. A train B moving with 30 ms'1 in the opposite direction and 130 m long crosses the first train in a time