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December 22, 2014

December 22, 2014

Posted by **Analica** on Thursday, March 15, 2012 at 9:46pm.

- Math -
**Steve**, Friday, March 16, 2012 at 11:50amstill-water speed: s

river speed: r

45 = 5(s-r) = 3(s+r)

5s - 5r = 45

3s + 3r = 45

multiply to match coefficients of r:

15s-15r=135

15s+15r=225

30s = 360

s=12

r=3

check:

45mi/9mph = 5 hr

45mi/15mph = 3 hr

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