Question
A boat takes 16 hours to cover 256 km upstream and 8
hours to cover the same distance downstream. Find the time taken by the boat to cover 192 km in still water.Solution
Upstream speed of the boat = 256 ÷ 16 = 16 km/h And downstream speed of the boat = 256 ÷ 8 = 32 km/h So, speed of the boat in still water = {(32 + 16)/2} = 24 km/h So, required time = (192 ÷ 24) = 8 hours
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