Question
just checking to see if i have this problem correct
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
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