A and B together can do a work in 4 days. If A alone can do it in 14 days. In how many days can B alone do it?	Select
A) 10  B) 6  C) 77  D) 55  E) 21

Rationale: 1 / 4 – 1 / 12 = 1 / 6 = > 6 answer : b
Answer: B