Question: Peter and Paul are running on a circular track.Peter completes one cycle in 7 minutes and Paul completes one cycle in 9 minutes.Suppose they start

Peter and Paul are running on a circular track.Peter completes one cycle in 7 minutes and Paul completes one cycle in 9 minutes.Suppose they start running at the same starting point now.How long will they take to meet again at the starting point if

(a) they run in the same direction

(b) they run in opposite direction

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