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1.

  • A. 2811hours
  • B. 2811hours
  • C. 2811hours
  • D. 2811hours

Answer: Option B

Explanation:

A in 1 hour fills 1/5 part

B in 1 hour fills 1/6 part

C in one hour empties 1/12 Part

Together they fill in 1 hour

= 1/5 + 1/6 - 1/12 = (12 + 10 - 5)/60 = 17/60 part

Total Time = 60/17 = 3 (9/17) hours

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