A motorcyclist X drives along a circular fence at a rate of 2 rounds per hour and another motor cyclist Y at a rate of 4 rounds per hour. After how long they will cross each other for the first time?
Since X and Y move in the same direction they cross each other when there is a difference of two round between the two. Relative speed of X and Y=4-2=2.
Time taken to complete one round at this speed = 1/2 hour
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