Ramesh can finish a piece of work in 18 days. Rohan is twice as efficient as Ramesh.If they work together how many days will they need to finish the same amount of work? Choose the correct option:  A) 8/3 days  B) 9/3 days  C) 6 days  D) 3 days  E) 7 days
Ramesh can finish a piece of work in 18 days. Rohan is twice as efficient as Ramesh.   So Rohan can finish a piece of work in 9 days.   days needed to finish the same amount of work = 1/(1/9+1/18)= 
<gadget id="calculator">1/(1/9+1/18)</gadget>
<output>6</output>
6 days   ANSWER:6 days
<result>C</result>
Ramesh can finish a piece of work in 18 days. Rohan is twice as efficient as Ramesh.If they work together how many days will they need to finish the same amount of work?