On a section of highway AB, A rides a bicycle from A to B, and B rides a motorcycle from B to A. They start at the same time, and after 80 minutes they meet. Go to A, and B will return immediately after arriving at B. How long will it take for A and B to meet again?
在AB一段公路上，甲骑自行车从A往B，乙骑摩托车从B往A，他们同时出发，经过80分钟两人相遇，乙到达A后马上折回，在第一次相遇后40分钟追上甲，乙到B地后也马上返回，再过多少时间甲与乙再相遇？
<gadget id="calculator">80 * 3</gadget>
<output>240</output>

<gadget id="calculator">240 - 80 - 40</gadget>
<output>120</output>

<result>120</result>