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December 21, 2014

December 21, 2014

Posted by **Taylor** on Monday, January 24, 2011 at 3:12pm.

- math -
**Reiny**, Monday, January 24, 2011 at 3:34pmher original speed be v

then vx = 100

her faster speed = v+5

(x-3)(v+5) = 100

xv + 5x - 3v - 15 = 100

100 + 5x - 3v = 115

5x - 3v = 15

v = (5x-15)/3

sub into 1st

x((5x-15)/3) = 100

5x^2 -15x = 300

x^2 - 3x - 60 = 0

I get x = 9.39 by using the formula (and v = 10.65)

check: (9.39)(10.65) = 100.0035

(6.39)(15.65) = 100.0035

YEAHH!

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