A work as fast as B. If B can complete a work in 12days independently,the number of days in which A and B can together finish the work in?	Select: A) 2days B) 3days C) 4days D) 5days E) 6days
Ratio of rates of working of A and B = 2:1   ratio of times taken = 1:2   A's 1day work = 1/6   B's 1day work = 1/12   A+B 1day work = 1/6 + 1/12  +  1= 
<gadget id="calculator"> +  1</gadget>
<output>1</output>
1/6 + 1/12= 3/12 = 1/4   A and B can finish the work in 4days   Answer is 4days
<result>C</result>
A work as fast as B. If B can complete a work in 12days independently,the number of days in which A and B can together finish the work in?