.
You can check your answer on your own.
I can add to it one simple thought:
In each 30 minutes Buddy and Ken install 3 panels;
Tom and Leonard install 2 panels.
Working together, the four install 3 + 2 = 5 panels each 30 minutes.
10 panels every hour . . .
The rest is on you.
This problem slightly differs from the standard joint work problems.
The difference is in that it works with discrete (integer) variables.
For traditional/standard joint work problems see the lessons
- Using Fractions to solve word problems on joint work,
- Solving more complicated word problems on joint work,
- Using quadratic equations to solve word problems on joint work,
- Solving rate of work problem by reducing to a system of linear equations,
- Selected joint-work word problems from the archive
in this site.