Question
A boat can travel 72 km upstream
and 108 km downstream in 5 hours. Find the speed of the boat in still water if the ratio of the speed of the boat in upstream to the speed of the boat in downstream is 2:3 respectively.Solution
Let the speed of the boat in upstream be ‘2x’ km/h and in downstream be ‘3x’ km/h, respectively. According to the question: 
Speed of the boat in still water = (2x+3x)/2 = (5×14.4)/2 = 36 km/h.
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