一段路程,甲行完全程要4小时,乙要5小时,甲乙两人的速度比是4:5. .
6÷ ==37.5%=12: =.
=12÷ =0.25=4: = %
1÷4==4: = %= (小数)
==6﹣ = ÷= 折.
:5=72: =18:15== % .