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April 18, 2015

Posted by **alyshan** on Wednesday, September 3, 2008 at 1:50pm.

NOTE:(Answer is 14.3 km/h,so can any one show me the solution).

- mathematics -
**David Q**, Wednesday, September 3, 2008 at 5:12pmThe speed in still water is X km/h, so the speed upstream is (X-3) km/h (slower than X because it's upstream), and the speed downstream is (X+3) km/h (faster than X because it's downstream).

Travelling at (X-3) km/h for 12 km will take 12/(X-3) hours, and travelling back again at (X+3) km/h for 12 km will take another 12/(X+3) hours.

But the whole journey takes 1.75 hours, so 12/(X-3) + 12/(X+3) = 1.75 = 7/4. We need to solve this for X. After a bit of algebraic shuffling of the above terms, we end up with 7X²-96X-63=0. One of the two solutions of this is negative and therefore impossible; the other one should be the answer you're looking for.

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