26.如圖,數(shù)軸上點(diǎn)A、B對(duì)應(yīng)著數(shù)10、15.C、D兩點(diǎn)同時(shí)從點(diǎn)A、原點(diǎn)O出發(fā)分別以lcm/s和2cm/s的速度沿?cái)?shù)軸向右運(yùn)動(dòng).設(shè)運(yùn)動(dòng)時(shí)間為ts.
(1)當(dāng)t=2時(shí),請(qǐng)說明BC=
AD;
(2)當(dāng)t>5,且CD=AB時(shí),求t的值;
(3)取線段CD的中點(diǎn)M,當(dāng)BM=
OA時(shí),求t的值.