Rohit and Rohan can complete a work in 12 days and 6 days respectively. How much time will they take when working together?  Choices: A) 4 B) 3 C) 5 D) 2 E) 1
Time taken by Rohit and Rohan = xy/ x+y   =12*6/(12+6)= 
<gadget id="calculator">12*6/(12+6)</gadget>
<output>4</output>
4 days   4NSWER:4
<result>A</result>
Rohit and Rohan can complete a work in 12 days and 6 days respectively. How much time will they take when working together?