A can knit a pair of socks in 3 days. B can knit the same thing in 6 days. If they are knitting together, in how many days will they knit two pairs of socks?
Choose the correct answer:	A) 4 days	B) 2 days	C) 4 1⁄2 days	D) 3 days	E) None of these
ExplanationA’s one day’s work = 1⁄3 rd work.   B’s one day’s work = 1⁄6 rd work.   (A + B)’s one day’s work = 1⁄3 + 1⁄6 = 1⁄2 nd work.   ∴ A and B together can complete the work (knit a pair of socks) in 2 days.   ∴ They together knit two pair of socks in 4 days.   4 daysnswer 4 days
<result>A</result>
A can knit a pair of socks in 3 days. B can knit the same thing in 6 days. If they are knitting together, in how many days will they knit two pairs of socks?