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Question
A crew can row a certain course up stream in 84 minutes; they can row the same course downstream in 9 minutes less than they can row in still water. How long would they take to row down with the stream?
A crew can row a certain course up stream in 84 minutes; they can row the same course downstream in 9 minutes less than they can row in still water. How long would they take to row down with the stream?
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Solution
The correct option is D 63
As the distance is kept constant, time is inversely proportional to speed and hence the time taken is in HM. Let the time required for rowing in still water be x, then rowing time down with stream will be x-9 , x is the HM of 84 and x-9 . Therefore x= 72 required time = x – 9 = 63; option(d).
As the distance is kept constant, time is inversely proportional to speed and hence the time taken is in HM. Let the time required for rowing in still water be x, then rowing time down with stream will be x-9 , x is the HM of 84 and x-9 . Therefore x= 72 required time = x – 9 = 63; option(d).
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