慢车的速度是快车的62.5%,两车从甲,乙两地同时相向而行,在离中点21km处相遇,相遇时快车行了多少千米?
问题描述:
慢车的速度是快车的62.5%,两车从甲,乙两地同时相向而行,在离中点21km处相遇,相遇时快车行了多少千米?
答
快车路程:慢车路程
=1:62.5%
=8:5
快车经过=21×2÷(8-5)×8=112千米