Question
The ratio of the speed of the boat in upstream to that
of in downstream is 5:9, respectively. If the speed of the current is 7 km/h, then find the speed of the boat in still water.Solution
According to the question: Let the speed of the boat in still water = x km/h Speed of the boat downstream = (x+7) km/h Speed of the boat upstream = (x−7) km/h ATQ, (x−7):(x+7)=5:9 9(x−7)=5(x+7) 9x−63=5x+35 9x−5x=35+63 4x=98 x=24.5 km/h
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