A can do a piece of work in 20 days. He works at it for 5 days and then B finishes it in 10 more days. In how many days will A and B together finish the work?

  • A. 8 days
  • B. 10 days
  • C. 12 days
  • D. 6 days
 

The correct answer is option A. 8 days. Can you explain this answer in the comments?


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A can do a piece of work in 20 days. He works at it for 5 days and then B finishes it in 10 more days. In how many days will A and B together finish the work?