Two intelligence agents, A and B, walked toward each other from the east city and the west city at the same time, and planned to meet and exchange information within 16 hours. However, 6 hours after A set off, A received a new mission and stayed there for 4 hours, and then continued to move forward. After another 8.5 I only met B in an hour. So how many hours did Agent A spend from the east city to the west city?
甲乙两个情报员同时从东城和西城相向而行，计划16小时相遇互换情报，可是甲出发6小时后，甲接到新任务在原地停留了4小时，然后继续前行，又经过了8.5小时才遇到乙．那么甲情报员从东城到西城共用了多少小时．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">18.5 * (3/4)</gadget>
<output>13.875</output>

<gadget id="calculator">10 + 13.875</gadget>
<output>23.875</output>

<result>23.875</result>