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Ramu saw in a NEWS channel that a goods ...

Ramu saw in a NEWS channel that a goods train of mass 200 metric ton moving with a velocity of 72 km `h^(-1)` collides with a passenger train of mass 300 metric ton with a velocity of 54 km `h^(-1)` coming in the opposite direction on the same track and both the trains move together after collision. He calculates their common velocity. Find what could be his answer.

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