The two cars depart at the same time every 20 minutes. How many times do they depart at the same time from 6:00 am to 5:00 pm?
两辆车每20分同时发一次车，从早上6点到晚上5点同时发车几次？
<gadget id="calculator">660 / 20</gadget>
<output>33</output>

<gadget id="calculator">33 * 2</gadget>
<output>66</output>

<gadget id="calculator">66 + 2</gadget>
<output>68</output>

<result>68</result>