A alone can complete a work in 12 days and B alone can complete the same work in 24 days. In how many days can A and B together complete the same work?

6 days
4 days
10 days
8 days

Correct Answer: 8 days

Explanation:

A's 1 day's work = 1/12
B's 1 day's work = 1/24
(A + B) 1 day's work = 1/12 + 1/24 days
= (2 + 1)/24 = 3/24 = 1/8
∴ (A + B)'s will finish the work in 8 days.

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