There are 10 stops in the middle of a bus line. There are two types of cars: express train and local train. The speed of the express train is 1.2 times that of the slow train. The local train stops at every station, while the express train only stops at one station in the middle, and the stop time at each station is 3 minutes. When a slow train departs 40 minutes later, the express train departs from the same starting station, and the two trains arrive at the end at exactly the same time. How long does it take for the express train to travel from the start point to the end point?
某公共汽车线路中间有10个站．车有快车及慢车两种，快车车速是慢车车速的1.2倍．慢车每站都停，快车则只停中间一个站，每站停留时间都是3分钟．当某次慢车发出40分钟后，快车从同一始发站开出，两车恰好同时到达终点．问快车从起点到终点共用多少时间？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

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

<gadget id="calculator">40 - 27</gadget>
<output>13</output>

<gadget id="calculator">1.2 - 1</gadget>
<output>0.2</output>

<gadget id="calculator">13 / 0.2</gadget>
<output>65</output>

<gadget id="calculator">65 + 3</gadget>
<output>68</output>

<result>68</result>