BRT Line 3 runs between Andingmen and Hongfuyuan Community. It is known that its departure time is equal. Teacher Su drove from Hongfuyuan Community to Andingmen, and she came head-on every 3 minutes A BRT, she surpasses a BRT every 12 minutes. The whole journey of BRT takes 45 minutes. Assuming that the speed of the bus and Mr. Su’s driving remains the same, how many minutes does it take for Mr. Su to drive from Hongfuyuan Community to Andingmen?
快速公交3号线行驶于安定门与宏福苑小区之间，已知它的发车间隔时间是相等的，苏老师开车从宏福苑小区到安定门，每过3分钟她的迎面就驶来一辆快速公交，每隔12分钟她就超过一辆快速公交．快速公交全程是45分钟，假设公交车和苏老师开车的速度都不变，那么苏老师开车从宏福苑小区到安定门需要多少分钟．
<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<result>27</result>