Question
The ratio of the speed of a motorboat to that of a
current of water is 36:5. The boat goes along with the current in 5 hours and 10 minutes it will come back in. type-sscSolution
Let the speed of boat in still water =B and speed of stream =S B:S =36:5 Speed of motorboat in downstream =B+S=41km/h Speed of motorboat in upstream =B-S=31km/h Distance= downstream speed × downstream time =41×31/6 Upstream time =Distance / upstream speed = (41×31/6)/31 =41/6 hours.
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