There are three fast, medium and slow cars starting from the same place at the same time, chasing a cyclist in front along the same road. The three cars took 6 minutes, 10 minutes, and 12 minutes to catch up with the cyclist. Now we know that the medium-speed car travels 20 kilometers per hour, and the slow-speed car travels 19 kilometers per hour. Q: How many kilometers does the fast car travel per hour?
有快、中、慢三辆车同时从同一地点出发，沿同一公路追赶前面的一个骑车人．这三辆车分別用6分钟、10分钟、12分钟追上骑车人．现在知道中速车每小时走20千米，慢速车每小时走19千米．问：快速车每小时走多少千米？
<gadget id="calculator">20 - 19</gadget>
<output>1</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/6) / (1/30)</gadget>
<output>5</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">19 - 5</gadget>
<output>14</output>

<gadget id="calculator">19 - 14</gadget>
<output>5</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/5) / (1/10)</gadget>
<output>2</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 14</gadget>
<output>24</output>

<result>24</result>