Question
A boat takes 12 hours to cover 180 km upstream and 9
hours to cover the same distance downstream. Find the time taken by the boat to cover 175 km in still water.Solution
Upstream speed of the boat = 180 ÷ 12 = 15 km/h And downstream speed of the boat = 180 ÷ 9 = 20 km/h So, speed of the boat in still water = {(20 + 15)/2} = 17.5 km/h So, required time = (175 ÷ 17.5) = 10 hours
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