sophillakittlelitt sophillakittlelitt

26-11-2016
Mathematics

contestada

The speed of a stream is 2 mph. A boat travels 4 miles upstream in the same time it takes to travel 8 miles downstream. What is the speed of the boat in still water?

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andriansp andriansp

29-11-2016

4 = (r-2) t

8 = (r+2) t

4 = (r-2) * [8/(r+2)]

4 = (8r-16)/ (r+2) . . .multiply by 2

4r + 8 = 8r - 16

4r = 24

r = 6

hope this helps

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