A person P takes 4 hrs time to complete a job and Q takes 6 hrs to complete the same job if they work together how much time will they require to complete the job?
Pick:
A) 1.2 hrs  B) 1.8 hrs  C) 2.4 hrs  D) 3.0 hrs  E) None of these
Explanation:   P’s 1 hr work =1/4   Q’s 1 hr work =1/6   (P+Q)’s 1 hr work= 1/4 +1/6 =5/12=&gt; time = 12/5= 
<gadget id="calculator">12/5</gadget>
<output>12/5 = around 2.4</output>
2.4 hrs   Answer: Option 2.4 hrs
<result>C</result>
A person P takes 4 hrs time to complete a job and Q takes 6 hrs to complete the same job if they work together how much time will they require to complete the job?