Three workers arrive at work 15 minutes late, at a cost of $11 hour.

They earned 8.25

Step-by-step explanation:

If they arrived late 15 minutes, then they lose a 1/4 of the pay. So they'd be making $8.25, and not the full $11 for that first hour.

So with this, you will be using proportions. In this case, our proportion is:

Firstly, cross-multiply: x^2=144

Next, square root both sides of the equation, and your answer will be x = 12