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January 30, 2015

January 30, 2015

Posted by **Paige** on Wednesday, March 2, 2011 at 6:26pm.

Sammy can cut wood twice as fast as Joe. When they both work together, it takes them 4 hrs. how long would it take them to do the job alone?

4/x +4/x+2 = x^2+2

4x+4x+8= x^2+2

8x+8= x^2+2

x^2-6x-8=0

(x-4)(x+2)

x=4 x=-2 since i can't use a -2 i have to put in a 4

x+2=4+2=6

Sammy =6 hours

6x2=12

Joe = 12 hours

Thanks

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