A, B, and C travel from Dongzhuang to Xizhuang. A and B set off at the same time at 6:00 in the morning. A travels 5 kilometers per hour, and B travels 4 kilometers per hour. C does not start until 8:00 in the morning. C and B arrive at Xizhuang at the same time, and ask when C will catch up with B?
甲，乙，丙三人从东庄到西庄，早上6点甲乙两人同时出发，甲每小时行5千米，乙每小时行4千米，丙早上8点才动身，到晚上6点甲丙两人同时到达西庄，问丙在什么时候追上乙？
<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<result>12</result>