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September 23, 2014

September 23, 2014

Posted by **Kelly** on Wednesday, November 9, 2011 at 9:30pm.

- Algebra -
**Reiny**, Wednesday, November 9, 2011 at 10:39pmspeed on first part --- x mph

time for first part = 49/x hrs

speed of second part = x-5 mph , where x > 5

time for second part = 25/(x-5)

49/x + 25/(x-5) = 5

multiply by x(x-5)

49(x-5) + 25x = 5x(x-5)

49x - 245 + 25x = 5x^2 - 25x

5x^2 - 99x + 245 = 0

x = (99 ± √4901)/10

= 16.9 or 2.9 but x > 5

on the first trip he went at 16.9 mph and on the second part 11.9 mph

WoW! 16.9 mph in a canoe!!

I am a canoist, don't know anybody who can paddle that fast.

- Algebra -
**Kelly**, Wednesday, November 9, 2011 at 10:45pmThank you!

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