Question 24Three 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:$\dfrac23$$\dfrac{11}{12}$$\dfrac32$$2$$3$