7. A boat covers a distance of 66 km, downstream in 110 minutes. If speed of boat
in still water is 34.5 km/hr, find the speed of the stream.
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120 minutes is the right answer
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Answer:
When the racing boat is going downstream its speed is (34.5+x) km/hr and while going upstream its speed is (34.5-x) km/hr. x = 36–34.5 = 1.5 km/hr. Check: 66/(34.5-x) = 66/(34.5–1.5) = 66/33 = 2 hours or 120 minutes.
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