A train 'X' is running with a speed of 50 km per hour from a place. From the same place after one hour another train 'Y' is running with a speed of 70 km per hour. After how much time will train Y be crossing train X?

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A train 'X' is running with a speed of 50 km per hour from a place. From the same place after one hour another train 'Y' is running with a speed of 70 km per hour. After how much time will train Y be crossing train X?