Jake Can Wash a Car in 40 Minutes, While Harold $\quad 40$

Multiple Choice

Jake can wash a car in 40 minutes, while Harold can wash the same car in 50 minutes. How long will it take them to wash the car if they work together?

A) $\quad 40$ minutes
B) $\frac { 9 } { 200 }$ minutes
C) 10 minutes
D) $\quad 30$ minutes
E) $\quad \frac { 200 } { 9 }$ minutes