Question
A boat takes a total of 6 hours to go 24 km downstream
and return 24 km upstream. The stream speed is 3 km/h. Find the speed of the boat in still water.Solution
Let speed in still water = b km/h. Then 24/(b + 3) + 24/(b β 3) = 6. β 48b = 6bΒ² β 54 β bΒ² β 8b β 9 = 0 β b = 9.
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