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【简答题】
如图，四边形AOBC是矩形，点A的坐标是（0，3），点B的坐标是（4，0），动点P，Q同时从点O出发，P沿折线OACB的方向运动，Q沿折线OBCA的方向运动． （1）若P的运动速度是Q的3倍，点P运动到AC边上，连接PQ交OC于点R，且OR=2，求直线PQ的函数关系式； （2）若P的运动速度是每秒 7 5 个单位长度，Q的运动速度是 4 5 个单位长度，运动到相遇时停止，设△OPQ的面积为S，运动时间为t秒，求S与t之间的函数关系式．
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