Question
A boat can cover 210 km in downstream in 10 hours and
160 km in upstream in 8 hours. Find the distance travelled by the boat in still water in 6 hours.Solution
Downstream speed of the boat = 210/10 = 21 km/hr Upstream speed of the boat = 160/8 = 20 km/hr Speed of boat in still water = (21 + 20)/2 = 20.5 km/hr Distance travelled by the boat in still water in 6 hours = 6 × 20.5 = 123 km
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