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If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?

Question and options

If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?
  1. 60
  2. 45
  3. 40
  4. 30

Answer and explanation

Correct answer: A - 60
A's rate = 115−120=4−360=160\frac{1}{15} - \frac{1}{20} = \frac{4-3}{60} = \frac{1}{60}, so A alone takes 60 days.

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  • CUSAT CAT Five-Year LL.B.

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