Question
Speed of current is equal to 30% of speed of boat in
still water. If the boat takes 6 hours to cover 120 km in still water, then find the time taken by the boat to cover 70 km in upstream.Solution
Speed of the boat in still water = 120 ÷ 6 = 20 km/h Speed of current = 20 × 0.3 = 6 km/h Therefore, upstream speed of the boat = 20 – 6 = 14 km/hr Required time taken = 70 ÷ 14 = 5 hours
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