Two taps can separately fill a cistern in $10$ $minutes$ and $15$ $minutes$ respectively. When the waste pipe is open,they can together fill it in $18$ $minutes$. The waste pipe can empty the full cistern in:
- A$7 \text{ minutes}$
- B$9 \text{ minutes}$
- C$13 \text{ minutes}$
- D$23 \text{ minutes}$
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