Question

a moving company charges $800 plus $16 per hour. Another moving company charges $720 plus $21 per hour. how many long is a job that costs the same no matter which company is used?

Answer 1

It is given in the question that

A moving company charges $800 plus $16 per hour. Another moving company charges $720 plus $21 per hour.

And let the number of hours be h hours.

So for the two companies, the equation of the cost are

$C = 16h + 800, C = 21h +720$

According to question

$16h +800=21h +720 \\ 800-720=21h -16h \\ 80 = 5h \\ h=16 hours$