On the weekend, my mother took Xiao Ming to the suburbs by bicycle, and walked uphill first. The speed was 140 m/min, and it took 5 minutes. Another section of downhill road was taken, the speed was 200 m/min, it took 3 minutes, and the rest was flat road. How many meters downhill did you go back and forth in this way?
周末，妈妈骑车带小明去郊外，先走了一段上坡路．速度140米/分，用了5分钟．又走了一段下坡路，速度是200米/分，用了3分钟，其余是平路．这样来回一共走了多少米的下坡路？
<gadget id="calculator">200 * 3</gadget>
<output>600</output>

<gadget id="calculator">140 * 5</gadget>
<output>700</output>

<gadget id="calculator">600 + 700</gadget>
<output>1_300</output>

<result>1_300</result>