Person A and Person B walk toward each other from places A and B at the same time, and meet each other 60 meters away from place A. After meeting, the two continue to move forward, return immediately after arriving at their destinations, and meet again at a distance of 20 meters from B. How many meters are there between A and B?
甲乙两人分别从A、B两地同时相向而行，行至离A地60米处相遇．相遇后两人继续向前行，分别到达目的地后立即返回，在离B地20米处再次相遇，AB两地相距多少米？
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">180 - 20</gadget>
<output>160</output>

<result>160</result>