If A completes work in 10 days, B in 20 days, together in?

Math

If A completes work in 10 days, B in 20 days, together in?

5 days

6.67 days

(Correct)

7 days

8 days

Explanation: Combined rate = 1/10 + 1/20 = 3/20 work/day. Time = 20/3 ≈ 6.67 days.

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