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【简答题】
如图，直线l分别交x轴、y轴于A、B两点，且 A(3 3 ，0) ，∠OAB=30°，动点P、Q同时从点O出发，同时到达A点，运动停止，点Q沿线段OA运动，速度为每秒 3 个单位长度，点P沿路线O→B→A运动． （1）求直线l的解析式； （2）设点Q的运动时间为t（秒），△OPQ的面积为S，求出S与t之间的函数关系式． （3）在（2）中，若t＞1 S= 3 3 2 ，求出此时P点的坐标，并直接写出以点O、P、Q为顶点的平行四边形的第四个顶点M的坐标．
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