.45 * 120 = 54
.072 * 54 = 3.888
54 + 3.888 = 57.888= $57.89
Answer:
15 and 5 hours.
Step-by-step explanation:
Call x the time taken by the first chap, and y the second.

Let's divide by 5 and play with the LHS of the first equation a bit:
we know how much x+y is ( first equation!) let's solve.
At this point it's easy to check that 
The answer to this is 3 bc 47*2=94
100-94=6
6/2=3
12*9= 108
4.5*4.5= 20.25
180-20.25= 159.75
answer is D