Question
The ratio of the speed of the boat in upstream to that
of in downstream is 4:7, respectively. If the speed of the current is 9 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+9) km/h Speed of the boat upstream = (x−9) km/h According to the question, 
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