Question
A boat takes 14 hours to cover 196 km upstream and 7
hours to cover the same distance downstream. Find the time taken by the boat to cover 168 km in still water.Solution
Upstream speed of the boat = 196 ÷ 14 = 14 km/h And downstream speed of the boat = 196 ÷ 7 = 28 km/h So, speed of the boat in still water = {(28 + 14)/2} = 21 km/h So, required time = (168 ÷ 21) = 8 hoursÂ
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