Answer: 8.8 hours
Explanation:
To start off, we’ll make an equation that “connects” both companies:
10 + 4.75h = 21 + 3.5h (we put h to represent the number of hours)
Move all similar terms to one side:
4.75h - 3.5h = 21 - 10
Simplify:
1.25h = 11
h = 8.8
I hope this helps!