Question

Sarah can wax her car in 8 hours. When she works together with Tara, they can wax the car in 30 minutes. How long would it take Tara, working by herself, to wax the car?

Answer 1

Sarah can wax 1/8 of a car in one hour.
Together they can wax 2 cars per hour.
Tara can wax 2 - 1/8 of a car per hour.

Answer 2

That is a different answer than it should be.

Answer 3

I have the answer but not sure how to work this problem.