A boat covers a certain distance downstream in 2 hours but takes 4 hours to return upstream to the starting point. If the speed of the stream be 3 km/hr, find the speed of the boat in still water.
Speed of the boat in still water = y (t2 + t1)/(t2 - t1) km/hr
= 3 (4 + 2)/(4 - 2)
= 9 km/hr
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