Two people walk a distance together, A walks 1200 meters per hour, B walks 1000 meters per hour, A takes 2 hours less than B to complete the distance. How long is this road in meters? (column equation solution)
两人同走一段路，甲每小时走1200米，乙每小时走1000米，甲比乙少用2小时走完这段路．这段路全长多少米？(列方程解答)
<gadget id="calculator">1_200 * 2</gadget>
<output>2_400</output>

<gadget id="calculator">1_200 - 1_000</gadget>
<output>200</output>

<gadget id="calculator">2_400 / 200</gadget>
<output>12</output>

<gadget id="calculator">1_000 * 12</gadget>
<output>12_000</output>

<result>12_000</result>