1.

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. If they meet fourth time each other at apoint D somewhere between X and Y, then what is the distance between D and X?

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Answer :D


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