Machine A can finish a job in 4 hours, Machine В can finish the job in 3 hours, and Machine С can finish the job in 6 hours. How many hours will it take for A, B, and С together to finish the job?
Choose the correct answer:	A) 3/2	B) 4/3	C) 5/4	D) 6/5	E) 8/7
The combined rate is 1/4+1/3+1/6 = 9/12 of the job per hour.   The time to complete the job is 12/9 = 4/3 hours.   The answer is 4/3.
<result>B</result>
Machine A can finish a job in 4 hours, Machine В can finish the job in 3 hours, and Machine С can finish the job in 6 hours. How many hours will it take for A, B, and С together to finish the job?