A

Admin • 825.56K Points
Coach

Q. Pipe A can fill a tank in 6 hours. Pipe B empties it in 18 hours. If A works for 3 hours and then both are opened, how long will the tank take to fill completely?

  • (A) 4 hours
  • (B) 5 hours
  • (C) 6 hours
  • (D) 7 hours
Explanation by: Admin
A fills half in 3 hrs. Remaining filled at rate (1/6−1/18)=1/9 → total = 6 hrs.

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