Three machines P, Q, and R, working together, can do a job in x hours. When working alone, P needs an additional 6 hours to do the job; Q, one additional hour; and R, x additional hours. The value of x is:
<spanclass=′latex−bold′>(A)</span>32<spanclass=′latex−bold′>(B)</span>1211<spanclass=′latex−bold′>(C)</span>23<spanclass=′latex−bold′>(D)</span>2<spanclass=′latex−bold′>(E)</span>3