It takes Jim two hours to wash the car and it takes Julia one hour to wash the car. Working together, how many minutes will it take them to wash the car? Choose the correct choice.
A) 36
B) 38
C) 40
D) 42
E) 44
Jim can wash (1/2) of the car per hour.   Julia can wash 1 car per hour.   Together they can wash 1/2+1=3/2 cars per hour.   1 car / (3/2) cars per hour = 2/3 hours = 40 minutes.   The answer is 40.
<result>C</result>
It takes Jim two hours to wash the car and it takes Julia one hour to wash the car. Working together, how many minutes will it take them to wash the car?