First. Two people, B, start from two places at the same time and walk towards each other. A walks 70 meters per minute, and B walks 50 meters per minute. After 20 minutes, the two pass the meeting point and are 100 meters apart. How many meters is the distance between the two places?
甲．乙两人分别从两地同时出发相对而行，甲每分钟行70米，乙每分钟行50米，20分钟后，两人过了相遇点又相距100米．问两地间的路程是多少米？
<gadget id="calculator">70 + 50</gadget>
<output>120</output>

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

<gadget id="calculator">2_400 - 100</gadget>
<output>2_300</output>

<result>2_300</result>