48*4.5=216
216/60=3.6小时
48*3.6=172.8
172.8+216=388.8
AB两地相距388.8公里.
(48/60*4.5+4.5)*48
=(0.8*4.5+4.5)*48
=(3.6+4.5)*48
=8.1*48
=388.8
48*4.5=216
216/60=3.6小时
48*3.6=172.8
172.8+216=388.8
AB两地相距388.8公里.
(48/60*4.5+4.5)*48
=(0.8*4.5+4.5)*48
=(3.6+4.5)*48
=8.1*48
=388.8