Math (urgent) hw due tommorow!

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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! -

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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