Answer: by the time Prius has worked 5 hours- $42, Mia only needs to work 2 hour to be able to make $42
When Mia has done 2 hours she earns $42
Prius has to do a total of 5 hours to earn $42
M:$21 per hour
P:$8.40 per hour
P:$8.40 x 5 = $42
M: $21 x 2 = $42