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September 18, 2014

September 18, 2014

Posted by **Nancy** on Thursday, April 5, 2012 at 1:25pm.

mi/hr?

- Math -
**Reiny**, Thursday, April 5, 2012 at 1:36pmlet the speed of the river be x mph

speed up stream = 12-x mph

time to go upstream = 24/)12-x)

speed downstream = 12+x

time to go downstream = 12/(12+x)

but those times are equal, so ...

24/(12-x) = 12/(12+x)

cross-multiply and solve for x

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