P walks around a circular field at the rate of 1 round per hour while Q runs around it at the rate of 5 rounds per hour. They start in the same direction from the same point at 9.10 A.M. they shall first cross each other at :
Solution: Since P and Q move in the same direction along the circle, so they will first meet each other when there is a difference of one round between the two
Relative speed of P and Q = (5 - 1) = 4 rounds per hour.
Time taken to complete one round at this speed = 1/4 hr = 15 min.
.'. 9.10 A.M. + 15 minutes = 9.25 A.M.
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