Question
Speed of current is equal to 15% of speed of boat in
still water. If the boat takes 3 hours to cover 120 km in still water, then find the time taken by the boat to cover 68 km in upstream.Solution
Speed of the boat in still water = 120 ÷ 3 = 40 km/h Speed of current = 40 × 0.15 = 6 km/h Therefore, upstream speed of the boat = 40 – 6 = 34 km/hr Required time taken = 68 ÷ 34 = 2 hours
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