Question
A boat can cover 140 km in downstream in 14 hours and 96
km in upstream in 12 hours. Find the distance travelled by the boat in still water in 5 hours.Solution
Downstream speed of the boat = 140/14 = 10 km/hr Upstream speed of the boat = 96/12 = 8 km/hr Speed of boat in still water = (10 + 8)/2 = 9 km/hr Distance travelled by the boat in still water in 5 hours = 9 × 5 = 45 km
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