A and B can finish a work in 12 days while A alone can do the same work in 24 days. In how many days B alone will complete the work?
Choose the correct choice from the following answers
A) 76 days
B) 48 days
C) 98 days
D) 31 days
E) 24 days

Rationale: "b = 1 / 12 – 1 / 24 = 1 / 24 = > 24 days answer : e"
Answer: E