Question: A and B start at the same time from P and Q (55 km apart) to Q and P at 3 and 2 km/h respectively.

A and B start at the same time from P and Q (55 km apart) to Q and P at 3 and 2½ km/h respectively. They meet at R, reach Q and P, return immediately and meet again at S. The distance from R to S is:

(a) 10 km

(b) 12 km

(c) 15 km

(d) 16 km

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