Xiao Ming runs from place A to place B at a fixed speed. At 8 am, he is 20 kilometers away from place B, and at 9:30 am he is 8 kilometers away from place B. When will Xiao Ming arrive at place B?
小明以一固定的速度从甲地跑到乙地，上午8时，他离乙地20千米，上午9时半他离乙地8千米，小明多少点到达乙地．
<result>10</result>