MATH HELP URGENT

Question

Troy and Tory are working on a computer together. They can make the computer in 10 hours while working together. Troy works at half the rate Tory does (ie it takes Troy two times longer to make the computer than it does Tory). How long does it take Tory to make the computer by herself? How long does it take Troy to make computer by himself?

Answer 1

1/2x + 1/x = 1/10

5 +10 = x

15 hours for Tory

30 hours for Troy