John, Paul and Peter can finish painting the fence in 2 hours. If John does the job alone he can finish it in 5 hours. If Paul does the job alone he can finish it in 6 hours. How long will it take for Peter to finish the job alone?
Step 1: Assign variables:
Let x = time taken by Peter
Step 2: Use the formula:
15+16+1x=12. Let's see if you can solve it from here. I know you can!
