A machine P completes a certain amount of work in 12 hrs and machine Q completes the same work in x hrs if both machines works together to complete the same work in 8 hrs then what is x? Choose the correct choice from the following answers
A) 12 hrs  B) 18 hrs  C) 24 hrs  D) 32 hrs  E) 34 hrs
Explanation:   P’s 1hr work = 1/12   Q’s 1 hr work = 1/x   (A+B)’s 1 hr work = 1/8 = 1/12+1/x   =&gt; x = 24 hrs   Answer: Option 24 hrs
<result>C</result>
A machine P completes a certain amount of work in 12 hrs and machine Q completes the same work in x hrs if both machines works together to complete the same work in 8 hrs then what is x?