Question
Speed of current is equal to 25% of speed of boat in
still water. If the boat takes 5 hours to cover 120 km in still water, then find the time taken by the boat to cover 90 km in upstream.Solution
Speed of the boat in still water = 120 ÷ 5 = 24 km/h Speed of current = 24 × 0.25 = 6 km/h Therefore, upstream speed of the boat = 24 – 6 = 18 km/hr Required time taken = 90 ÷ 18 = 5 hours
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