Mr. Wang was going to the Education Bureau for a meeting. When he set off, he looked at his watch and found that if he walked 100 meters per minute, he would be 6 minutes late. If he rode a bicycle at 200 meters per minute, he could arrive 3 minutes earlier. Ask Mr. Wang How many minutes will be left when leaving?
王老师要到教育局开会，出发的时候他看了一下手表，发现如果步行每分钟100米，则要迟到6分钟，如果骑自行车每分钟行200米，则可以提前3分钟到达，问王老师出发时离开会还有多少分钟？
<gadget id="calculator">100 * 6</gadget>
<output>600</output>

<gadget id="calculator">200 * 3</gadget>
<output>600</output>

<gadget id="calculator">600 + 600</gadget>
<output>1_200</output>

<gadget id="calculator">200 - 100</gadget>
<output>100</output>

<gadget id="calculator">1_200 / 100</gadget>
<output>12</output>

<result>12</result>