Mingming and Honghong ran along the 400-meter circular runway. The two of them started from the same place at the same time and walked in the same direction. Mingming ran 280 meters per minute. After 10 minutes, Mingming caught up with Honghong for the first time. How many meters run per minute? (solution by equation)
明明和红红沿着400米的环形跑道跑步，他们二人同时从同一地点出发同向而行，明明每分钟跑280米，经过了10分明明第一次追上了红红，则红红每分钟跑多少米？(用方程解)
<gadget id="calculator">280 * 10</gadget>
<output>2_800</output>

<gadget id="calculator">2_800 - 400</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 / 10</gadget>
<output>240</output>

<result>240</result>