Question
A boat takes 6 hours to cover 108 km in downstream. The
ratio of the speed of the boat in still water to the speed of the stream is 8:1. Find the speed of the boat while going upstream.Solution
ATQ, Speed of boat in downstream = 108 ÷ 6 = 18 km/h
Let speed of boat in still water and speed of stream be 8x km/h and x km/h
Ratio of downstream to upstream = (8x + x)/(8x – x) = 9x/7x = 9:7
Therefore, speed upstream = (18 × 7)/9 = 14 km/h
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