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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 X and Y. After starting their race, they meet each other for the n^(th) time at point X, then what is the minimum possible value of n?

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