The distance between the two places is 1720 meters. A and B are walking towards each other. A walks 70 meters per minute, and B walks 55 meters per minute. After walking for 2 minutes, A goes home because of something, and then walks back at the same speed, so how many minutes will it take for the two to meet.
两地相距1720米，甲、乙相对而行，甲每分钟走70米，乙每分钟走55米．甲走了2分钟后因事回家，再以同样的速度往回走，这样两人相遇时要用多少分钟．
<gadget id="calculator">2 + 2</gadget>
<output>4</output>

<gadget id="calculator">55 * 4</gadget>
<output>220</output>

<gadget id="calculator">1_720 - 220</gadget>
<output>1_500</output>

<gadget id="calculator">70 + 55</gadget>
<output>125</output>

<gadget id="calculator">1_500 / 125</gadget>
<output>12</output>

<gadget id="calculator">12 + 4</gadget>
<output>16</output>

<result>16</result>