A train X starts from a place at a speed of $50$ km/hr. After one hour, another train Y starts from the same place at a speed of $70$ km/hr. After how much time will Y cross X?
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A train X starts from a place at a speed of $50$ km/hr. After one hour, another train Y starts from the same place at a speed of $70$ km/hr. After how much time will Y cross X?