如图,在四边形ABCD中,∠BCD=90°.AB‖AD,AB=AD=10cm.BC=8cm,点P从点A出发以3cm/s的速度沿折现ABCD的方向运动,点Q从点D出发,以2cm/s的速度沿线段DC的方向运动,P,Q同时出发,当点Q到达点C时,P,Q都停止运动,设
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