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

The speed of a stream is 3 km/h. A boat travels 25 km upstream in the same time it takes to travel 35 km downstream. What is the speed of the boat in still water?

- Math (urgent) hw due tommorow! -
**Reiny**, Monday, August 30, 2010 at 9:23pm
speed 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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