There are two places X and Y, 200 km apart from each other. Initially two persons P and Q both are at ‘X’. The speed of P is 20 km/h and speed of Q is 30 km/h. Later on they starts to move to and fro between Xand Y.
After starting their race, they meet each other for the nth time at point X,then what is the minimum possible value of n?





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