Question
A boat takes 3 hours 45 minutes to cover 67.5 km in
downstream. The ratio of the speed of the boat in still water to the speed of the stream is 5:1. Find the speed of the boat while going upstream.Solution
ATQ, Speed of boat in downstream = 67.5 ÷ 3.75 = 18 km/h
Let speed of boat in still water and speed of stream be 5x km/h and x km/h
Ratio of downstream to upstream = (5x + x)/(5x – x) = 6x/4x = 3:2
Therefore, speed upstream = (18 × 2)/3 = 12 km/h
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