
如圖所示,在△ABC中,BC=7cm,AB=25cm,AC=24cm,P點(diǎn)在BC上從B點(diǎn)向C點(diǎn)運(yùn)動(dòng)(不包括點(diǎn)C),點(diǎn)P的運(yùn)動(dòng)速度為2cm∕s;Q點(diǎn)在AC上從C點(diǎn)向點(diǎn)A運(yùn)動(dòng)(不包括點(diǎn)A),運(yùn)動(dòng)速度為5cm∕s,若點(diǎn)P、Q分別從B、C同時(shí)運(yùn)動(dòng),請(qǐng)解答下面的問(wèn)題,并寫出主要過(guò)程.
(1)經(jīng)過(guò)多長(zhǎng)時(shí)間后,P、Q兩點(diǎn)的距離為5
cm?
(2)經(jīng)過(guò)多長(zhǎng)時(shí)間后,△PCQ面積為15cm
2?