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【简答题】
如图，已知直线l的函数表为 ，且l与x轴，y轴分别交于A，B两点，动点Q从B点开始在线段BA上以每秒2个单位长度的速度A移动，同时动点P从A点开始在线段AO上以每秒1个单位长度的速度O移动，设点Q，P移动的时间为t秒。 （1）求出点A，B的坐标； （2）当t为何值时，△APQ与△AOB相似？ （3）求出（2）中当△APQ与△AOB相似时，线段PQ所在直线的函数表。
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