Question
Speed of current is equal to 20% of speed of boat in
still water. If the boat takes 2 hours to cover 120 km in still water, then find the time taken by the boat to cover 72 km in upstream.Solution
Speed of the boat in still water = 120 ÷ 2 = 60 km/h Speed of current = 60 × 0.20 = 12 km/h Therefore, upstream speed of the boat = 60 – 12 = 48 km/hr Required time taken = 72 ÷ 48 = 1.5 hours
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