Two people, A and B, start from A and B at the same time and walk toward each other, and meet at a distance of 4 kilometers from the midpoint. It is known that A travels 2 kilometers longer than B per hour, and A's speed decreases by 2 kilometers per hour after the encounter. So how many hours after the two meet, A will arrive at B.
甲、乙两人分别从A、B两地同时出发相向而行，在距离中点4千米处相遇．已知甲每小时比乙多行2千米，相遇后甲的速度降低2千米/时．那么两人相遇后再过多少小时甲到达B地．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<result>4</result>