posted by Tommy on .
Jenny can shovel snow from her driveway in 60 minutes. Tom can do the same job in 55 minutes. How long would it take both of them together to shovel the drivway if they worked together.
I am coming up with 28 minutes.. is this correct or is it in fraction form?
T = (60 * 55) /(60 + 55) = 28.7 min.