Mr. Yang’s car travels a section of 1800 meters. This section of the route consists of a section of flat road and an uphill section. The flat road travels 200 meters per minute, and the uphill section travels 80 meters per minute. It takes 15 minutes to complete the journey. How much is this section of flat road? rice?
杨老师汽车行一段1800米的路，这段路由一段平路和一段上坡路组成，其中平路每分钟行200米，上坡路每分钟行80米，行完全程用了15分钟，这段平路有多少米？
<gadget id="calculator">1_800 - 1_200</gadget>
<output>600</output>

<gadget id="calculator">600 / 120</gadget>
<output>5</output>

<gadget id="calculator">200 * 5</gadget>
<output>1_000</output>

<result>1_000</result>