Post a New Question


posted by .

a motorboat can go 24 miles downstream in the same amount of time that it takes to go 12 miles upstream. The boats speed in still water is 12 mph. What is the speed of the river?

  • Math -

    let 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

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

More Related Questions

Post a New Question