A walks 50 meters per minute, B walks 60 meters per minute, and C walks 70 meters per minute. Two people, A and B, start from A, and C starts from B at the same time. After meeting B, C encounters A again 2 minutes later. Find the distance between A and B.
甲每分钟走50米，乙每分钟走60米，丙每分钟走70米．甲、乙两人从A地，丙一人从B地同时相向出发，丙遇到乙后2分钟又遇到甲，求A、B两地的距离．
<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">70 + 60</gadget>
<output>130</output>

<gadget id="calculator">120 * (1/5) * 130</gadget>
<output>3_120</output>

<result>3_120</result>