Question
A boat can travel 15 km upstream and 21 km downstream in
3 hours. Find the speed of the boat in still water if the speed of the stream is 1.5 km/h.Solution
Let the speed of the boat in still water be ‘x’ km/h. Upstream speed = ‘x – 1.5’ km/h Downstream speed = ‘x + 1.5’ km/h According to the question: 
Thus, the speed of the boat in still water is 12.5 km/h .
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