Question

Together, Bob and Tom take 4 hours to get the yard work done. If Bob works alone, it takes him 6 hours. How long would it take Tom, working alone, to do all of the yard work?


10 hours
12 hours
8 hours
9 hours

Answer 1

B = hours Bob can complete job alone
M = hours Tom can complete job alone
T = Time it takes if they both work together

Working Together Formula:

\[\frac{BM}{B + M} = T\]

B = 6
T = 4
M = ?

\[\frac{6M}{6 + M} = 4\]

Answer 2

Solve for \(M\)

Answer 3

So what does M equal?