Question
A boat can cover 180 km in downstream in 18 hours and
125 km in upstream in 5 hours. Find the distance travelled by the boat in still water in 10 hours.Solution
Downstream speed of the boat = 180/18 = 10 km/hr Upstream speed of the boat = 125/5 = 25 km/hr Speed of boat in still water = (10 + 25)/2 = 17.5 km/hr Distance travelled by the boat in still water in 10 hours = 17.5 × 10 = 175 km
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