$A$ pipe can fill a tank with thrice the speed of another pipe. If both the pipes together take $36$ $min$ to fill an empty tank completely,then how much time will it take for the slower pipe to fill the tank alone?
- A$1$ $hour$ $21$ $min$
- B$1$ $hour$ $28$ $min$
- C$2$ $hours$
- D$2$ $hours$ $24$ $min$
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