A can do a piece of work in 8 days. He works at it for 4 days and then B finishes it in 6 days. In how many days can A and B together finish the work? Select the correct option:
A) 4.1 days
B) 4.8 days
C) 3.8 days
D) 2.8 days
E) 4.5 days

Rationale: 4 / 8 + 6 / x = 1 = > x = 12 1 / 8 + 1 / 12 = 5 / 24 = > 4.8 days answer : b
Answer: B