Cars A and B start at the same time from places A and B, which are 60 kilometers apart, and drive toward each other, and meet at a certain place 3 hours later. So how many hours did it take for the two cars to be separated by 40 kilometers for the first time and 40 kilometers for the second time?
甲、乙两车从相距60千米的A，B两地同时出发相向而行，3小时后在某地相遇．那么两车从第一次相距40千米到第二次相距40千米经过了多少小时．
<gadget id="calculator">40 + 40</gadget>
<output>80</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">80 / 20</gadget>
<output>4</output>

<result>4</result>