A is twice as fast as B. If B alone can do a piece of work in 24 days, in what time can A and B together complete the work?	Choose the correct choice from the following.
A) 10
B) 12
C) 6
D) 2
E) 8

Rationale: a can do the work in 24 / 2 i . e . , 12 days . a and b ' s one day ' s work = 1 / 12 + 1 / 24 = ( 2 + 1 ) / 24 = 1 / 8 so a and b together can do the work in 8 days . answer : e
Answer: E