Question
There is a road beside a river. Two friends, A and B.
started their journey from place P, moved to the garden located at another place Q and then returned to place P. A moved by swimming at a speed of 15 km/h while B sailed on a boat at a speed of about 18 km/h. If the flow of water current is at the speed of 6 km/h, what will be the average speed (in km/h) of the boat sailor?Solution
Clearly the person moves both ways at a speed of 15 km/hr.  The boat sailor moves downstream = (18 + 6) i.e., 24 km/hr and Upstream = (18-6)i.e., 12 km/hr.  So, average speed of the boat sailor = (2 x 24 x 12)/(24+12)) km/hr (576/36) km/hr = 16 km/hr
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