Two people, A and B, are traveling toward each other from AB at the same time, and A's speed is three times that of B's. After 60 minutes, the two meet. Then, the speed of A is reduced to half of the original speed, and the speed of B remains the same. The two continue to move forward. Then, when A arrives at B, how many minutes will pass before B arrives at A land.
甲乙两人分别从AB两地同时相向而行，甲的速度是乙的3倍．经过60分钟，两人相遇，然后，甲的速度减为原速的一半，乙的速度不变，两人各自继续前行，那么，当甲到达B地后，再经过多少分钟，乙到达A地．
<gadget id="calculator">180 - 40</gadget>
<output>140</output>

<result>140</result>