Xiaoqiang and Xiaoming start from home at the same time and walk towards each other. Xiaoqiang walks 50 meters per minute, and Xiaoming walks 70 meters per minute. After 20 minutes, the two meet. How many meters are there between them?
小强和小明两人同时从家中出发相向而行，小强每分钟走50米，小明每分钟走70米，经过20分钟两人相遇，他们两家相距多少米？
<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">120 * 20</gadget>
<output>2_400</output>

<result>2_400</result>