A, B, and C are three people. A and B go from Dongzhen to Xizhen, and C goes from Xizhen to Dongzhen. The three start at the same time. On the way, C meets B and then meets A after 2 minutes. If A travels 50 times per minute m, B travels 60 meters, and C travels 70 meters. Then, how many minutes before B arrives at West Town than A?
甲、乙、丙三人，甲、乙从东镇去西镇，丙从西镇去东镇，三人同时出发，途中丙与乙相遇2分钟后又遇到甲，如果每分钟甲行50米，乙行60米，丙行70米，那么，乙比甲早多少分钟到达西镇？
<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

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

<gadget id="calculator">240 / 10</gadget>
<output>24</output>

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

<gadget id="calculator">24 * 130</gadget>
<output>3_120</output>

<gadget id="calculator">3_120 / 50</gadget>
<output>312/5 = around 62.4</output>

<gadget id="calculator">3_120 / 60</gadget>
<output>52</output>

<gadget id="calculator">(312/5) - 52</gadget>
<output>52/5 = around 10.4</output>

<result>52/5 = around 10.4</result>