If two workers can assemble a car in 8 hours and a third worker can assemble ... ...

If two workers can assemble a car in 8 hours and a third worker can assemble the same car in 12 hours, then how long would it take the three workers together to assemble the car? 


(A) 5/12 hrs.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set V: Word Problems