A, B, and C ride bicycles and set off at the same time, chasing a pedestrian in front of them. They use 6 minutes, 9 minutes, and 12 minutes to catch up with pedestrians respectively. It is known that A travels 400 meters per minute, and B travels 360 meters per minute. Question: How many meters does C travel per minute?
甲、乙、丙三人骑车同时出发，追赶前面的一个行人．他们分别用6分、9分、12分追上行人，已知甲每分钟行400米，乙每分钟行360米．问：丙每分钟行多少米？
<gadget id="calculator">400 - 360</gadget>
<output>40</output>

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

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) - (1/10)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/10) / (1/20)</gadget>
<output>2</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<gadget id="calculator">360 - 80</gadget>
<output>280</output>

<gadget id="calculator">400 - 280</gadget>
<output>120</output>

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

<gadget id="calculator">(1/10) / (1/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">120 * (1/2)</gadget>
<output>60</output>

<gadget id="calculator">280 + 60</gadget>
<output>340</output>

<result>340</result>