如圖,數(shù)軸上A,B兩點(diǎn)對(duì)應(yīng)的有理數(shù)分別為-3和8,動(dòng)點(diǎn)P從點(diǎn)A出發(fā),以每秒2個(gè)單位的速度沿?cái)?shù)軸在A,B之間往返運(yùn)動(dòng),同時(shí)動(dòng)點(diǎn)Q從點(diǎn)B出發(fā),以每秒1個(gè)單位的速度沿?cái)?shù)軸在B,A之間往返運(yùn)動(dòng),當(dāng)點(diǎn)Q返回至點(diǎn)B時(shí),整個(gè)運(yùn)動(dòng)過程停止.設(shè)運(yùn)動(dòng)時(shí)間為t秒.
(1)當(dāng)t=3時(shí),點(diǎn)P對(duì)應(yīng)的有理數(shù)是
3
3
,PQ的長(zhǎng)度是
2
2
;
(2)當(dāng)0<t≤11時(shí),若點(diǎn)Q運(yùn)動(dòng)到整數(shù)點(diǎn)2,則點(diǎn)P所在的數(shù)字是
7
7
.