Xiaoming and Xiaohong set off from Huangyan and Luqiao by bicycle at the same time. They met on the way in 40 minutes. Xiaoming took 70 minutes to complete the journey. Xiaohong rode 180 meters per minute.
小明和小红同时骑自行车从黄岩和路桥两站相对出发，40分钟在途中相遇，小明行完全程用70分钟，小红每分钟骑180米，黄岩与路桥两站相距多少千米．
<gadget id="calculator">70 - 40</gadget>
<output>30</output>

<gadget id="calculator">40 / 30</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">180 * (4/3)</gadget>
<output>240</output>

<gadget id="calculator">240 + 180</gadget>
<output>420</output>

<gadget id="calculator">40 / 1_000</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">420 * (1/25)</gadget>
<output>84/5 = around 16.8</output>

<result>84/5 = around 16.8</result>