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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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