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If a pipe can fill a tank in 6 hours, find the part of tank it fills in one hour.

  • A.1/6
  • B.2/3
  • C.1/2
  • D.None of these

Answer: A

If the whole tank takes 6 hours, then in one hour the pipe fills

\[ \frac{1}{6} \text{ of the tank} \]

This reciprocal is the basic move in every pipes-and-cisterns problem: times cannot be added, but rates can.

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