I need help with this story problem please help me!!

Algebra
Tutor: None Selected Time limit: 1 Day

Two students started their own computer business. Working alone one student can build a computer in 18h. When 2nd student helps build the computer they build it in 7.2h. How long would it take for the 2nd student, working alone to build the computer?

Nov 6th, 2014

rate of student A=1/18(t)

Rate of student B=1/x (t)

therefore

1/18+1/x=1/7.2

1/x=1/7.2-1/18

1/x=0.0833333

x=1/0.0833333

x=12

working alone the student takes 12 hours

please best my answer. welcome

Nov 6th, 2014

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