The walking speeds of A, B, and C are 70 meters, 60 meters, and 50 meters per minute respectively. A starts from point B, and B and C start from point A at the same time and walk toward each other. A meets B on the way, and then encounters another 2 minutes later. To C, find the distance between A and B.
甲、乙、丙三人的步行速度分别为每分钟70米、60米和50米，甲从B地，乙和丙从A地同时出发相向而行，途中甲遇到乙后2分钟又遇到丙，求A、B两地距离．
<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>