When two computers are working together, they can finish updating software in 9 minutes. how long would they take individually to update the software if one computer takes 24 minutes longer than the other?

First computer takes x min. For 1 min it does 1/x part of work.

Second computer takes (x+24) min. For one min it does 1/(x+24) part of work.

Both computers for one min do   (1/x+1/(x+24)) part of work.

At the same time, both computers for one min do 1/9 part of work.

Ibelieve the answer is c