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September 21, 2014

September 21, 2014

Posted by **john** on Monday, July 23, 2012 at 11:15pm.

- math -
**Reiny**, Tuesday, July 24, 2012 at 12:35amspeed of boat ---- x mph

speed downstream = x+4

speed upstream = x-4

time upstream = 24/(x-4)

time downstream = 40/(x+4)

40/(x+4)= 24/(x-4)

cross-multiply

40x - 160 = 24x + 96

16x = 256

x = 16

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