Answer:
2 hours
Step-by-step explanation:
Let x=hours
80+16x is the money required for the first company after x hours
following that same thought,
72+20x will be the money required for the second company after x hours
we're using x for both equations because we want to find out how many hours many the prices equal to one another
therefore, set the equations equal to one another
80+16x=72+20x
-72 -72
______________
8+16x=20x
-16x -16x
______________
8=4x
divide both sides by 4 and we get x=2 hours
You can check this by plugging 2 back into the equation 80+16x=72+20x
