Nikita and Annu can do o work in 30 and 60 days.
espectively. If they started working together,
hen that work will finished in how many days?
15 days b 20 days c 25 days d 35 days
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Answer: b 20 days
1/30 + 1/60 = 1/20
days taken will be 1/20 ^-1=20 days
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