Question
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.Solution
ATQ, Let the speed of boat in still water be x km/hr Speed of stream = y km/hr Speed upstream = (x - y) km/hr (x - y) = 35/2 = 17.5Â Â Â ----(1) Speed downstream = (x + y) km/hr (x + y) = 35/7 = 5Â Â Â Â ----(2) From (1) and (2), we get x = 11.25 km/hr Speed of boat in still water = 11.25 km/hr
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