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1. Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many will the tank be filled?

  • A. 2
  • B. 2
  • C. 2
  • D. 2

Answer: Option C

Explanation:


Hints: Pipe A, B, and C can fill the tank in 1 hour

( 1/5 + 1/10 + 1/30) portion

= (12 + 6 + 2)/6o portion

= 20/60 portion

= 1/3 portion

All three pipes will fill the tank in 3 hours.


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