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A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?

10.5
8
8.4
9

Correct Answer: 8.4

Explanation:

One day's work of A and B = 1/14 + 1/21 = 5/42
∴ Required number of days = 42/5 = 8.4 days

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