The distance between the east and west villages is 80 kilometers. Two people, A and B, ride bicycles from the east and west villages at the same time and drive toward each other. They meet after 4 hours. It is known that A travels 8 kilometers per hour. What is the speed?
东、西两村相距80千米，甲、乙两人骑车分别从东、西两村同时出发相向而行，4小时后两人相遇，已知甲每小时行8千米，求乙的速度是多少？
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<result>12</result>