A works twice as fast as B.If B can complete a work in 12 days independently,the number of days in which A and B can together finish the work is : Choose the correct choice from the following:
A) 4 days  B) 6 days  C) 8 days  D) 18 days  E) None of these
Solution   Rates of worktio of raing of A and B = 2: 1.So, ratio of times taken = 1: 2   ∴ A’s 1 day’s work = 1/6 B’s 1 day’s work =1/12   (A + B)'s 1 day’s work =(1/6 + 1/12)= 3/12=1/4   So,A and B together can finish the work in 4 days.   4 daysnswer 4 days
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A works twice as fast as B.If B can complete a work in 12 days independently,the number of days in which A and B can together finish the work is :