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A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work in: - Aptibook
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A. 4 days

B. 6 days

C. 8 days

D. 18 days

Answer : 4 days

Ratio of rates of working of A and B = 2: 1.

So, ratio of times taken = 1: 2. ( ஃ Time and work are inversely proportional)

B’s 1 day’s work = 1/12

ஃ A’s 1 day’s work = 1/6 (ஃ 2 times of B’s work)

ஃ (A + B)’s 1 day’s work = (1/6 + 1/12) = 3/12 = 1/4

So, A and B together can finish the work in 4 days.

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