# The bill for the repair of a car was $420. The cost of parts was$240. The cost of labor was $45 per hour. How many hours did the repair take? ##### 1 Answer Mar 16, 2018 #### Answer: 4 hours #### Explanation: the bill for the repair of a car was$420. This means the equation is going to equal (=) 420.

420 - 240 = 180.

Subtract the cost of parts from the total bill.

Now the cost of labor was \$45 per hour. Now let's figure out what 180 ÷45 = ?

it's 4.