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July 25, 2014

July 25, 2014

Posted by **Lisa L** on Tuesday, July 24, 2012 at 11:15pm.

- Math Word Problem -
**Reiny**, Wednesday, July 25, 2012 at 10:52amspeed of boat --- x mph

speed upstream = x-6

speed downstream = x+6

5/(x-6) - 5/(x+6) = 20/60 = 1/3

times 3(x-6)(x+6)

15(x+6) - 15(x-6) = x^2 - 36

15x + 90 - 15x + 90 = x^2 - 36

x^2 = 216

x = √216 = appr 14.7 mph

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