A work as fast as B. If B can complete a work in 20days independently,the number of days in which A and B can together finish the work in?  Choose the correct choice from the following:  A) 20/3days  B) 10/3days  C) 15days  D) 10days  E) 20days
Ratio of rates of working of 20/3days and B = 2:1   ratio of times taken = 1:2   20/3days's 1day work = 1/10   B's 1day work = 1/20   20/3days+B 1day work = 1/10 + 1/20  +  1= 
<gadget id="calculator"> +  1</gadget>
<output>1</output>
1/10 + 1/20= 3/20 =3/20   20/3days and B can finish the work in 20/3days   20/3daysnswer is 20/3days
<result>A</result>
A work as fast as B. If B can complete a work in 20days independently,the number of days in which A and B can together finish the work in?