Among A, B, and C, A walks 50 meters per minute, B 60 meters, and C 70 meters. A and B start from A, and C start from B at the same time. C encounters A 2 minutes after meeting B. Ask AB how far is the distance between the two places?
甲、乙、丙三人中，甲每分钟走50公尺，乙60公尺，丙70公尺．甲、乙两人从A地，丙从B地同时相向出发，丙遇乙后2分钟遇到甲，问AB两地相距多远﹖
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

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

<result>3_120</result>