He wants to earn 132. And he earns 6.25 per hour. Let's say x equals the number of hours he needs to work in order to earn 132.
132 = 6.25x
Use inverse operations and divide both sides by 6.25.
6.25x/6.25 = x
132/6.25 = 21.12
0.12 of a minute can be solved by multiplying 0.12 by 60, which is 7.2.
0.12 of a minute equals 7.2 minutes.
Therefore, 21 hours and 7.2 minutes.
(If you want a rounded answer, though, you can say about 22 hours)