Pipe A fills a tank in 6 hours and pipe B in 3 hours. Working together, how long do they take?

  1. 2 hours
  2. 4.5 hours
  3. 1.5 hours
  4. 9 hours
Answer

A) 2 hours

Rates add: tfrac16+tfrac13=tfrac12 tank per hour, so 2 hours.

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