1.如圖,AB=12cm,∠CAB=∠DBA,AC=BD=9cm.點(diǎn)P在線段AB上以3cm/s的速度由點(diǎn)A向點(diǎn)B勻速運(yùn)動(dòng),同時(shí),點(diǎn)Q在線段BD上由點(diǎn)B向點(diǎn)D勻速運(yùn)動(dòng),設(shè)運(yùn)動(dòng)時(shí)間為t s,點(diǎn)Q的運(yùn)動(dòng)速度為x cm/s.
(1)用含字母x,t的式子分別表示線段AP,BP,BQ的長(zhǎng)度;
(2)當(dāng)△BPQ與△ACP全等時(shí),求x和t的值.