The distance between A and B is 60 kilometers. Two people, A and B, start from A to B by bicycle at the same time. A is slower than B by 4 kilometers per hour. When B arrives at city B, he immediately returns from the original road and meets A at a distance of 12 kilometers from city B. How many kilometers does A travel per hour?
A、B两城相距60千米，甲、乙两人同时从A城骑自行车出发前往B城．甲比乙每小时慢4千米，乙到B城后立即从原路返回，于距B城12千米处与甲相遇．甲每小时行多少千米？
<gadget id="calculator">60 - 12</gadget>
<output>48</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">12 * (1/2)</gadget>
<output>6</output>

<gadget id="calculator">48 / 6</gadget>
<output>8</output>

<result>8</result>