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December 21, 2014

December 21, 2014

Posted by **anj** on Monday, August 30, 2010 at 8:52pm.

- Math (urgent) hw due tommorow! -
**Reiny**, Monday, August 30, 2010 at 9:23pmspeed of boat in still water ---> x km/h

time to go 25km upstream = 25/(x-3)

time to go 35 km downstream = 35/(x+3)

but those two times are supposed to be equal, so ..

25/(x-3) = 35/(x+3)

cross-multiply, then solve for x

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