A boat covers 35 km downstream in 2 h and covers the same distance upstream in 7 h. Find the speed (in km/h) of the boat in still water.
speed of a boat downstream = 35/2=17.5km/h speed upstream =35/7=5km/h now the speed of the boat in still water = 17.5+5/2 =22.5/2=11.25km/h
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