Answer:
5 hours.
Explanation:
Let x be the number of hours.
Abe, a plumber, charges $50 per hour plus $75 for making an in-home visit.
Cost of Abe =
....(1)
The Plumbing Service charges $65 per hour but no set fee for a visit.
Cost of Abe =
.... (2)
We need to find the hours of pluming work are needed for each to cost the same.
From (1) and (2) we get
Divide both sides by 15.
Therefore, 5 hours of pluming work are needed for each to cost the same.