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Q:

P, Q and R can finish a work in 5 days, 10 days, and 15 days, respectively, working alone. P and Q works on first day, P and R works on second day and P and Q works on third day and son on till the work is completed. In how many days the work will be completed?

  • 1
    $${13\over 2}$$
  • 2
    $${9\over 2}$$
  • 3
    $${7\over 2}$$
  • 4
    $${5\over 2}$$
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Answer : 3. "$${7\over 2}$$"

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