智力测验题（英语）I only have two minutes to catch the train,but there are two miles from my house to the train station.If I go the first mile at the rate（速率)of 45 miles per hours ,at what rate must I go the second mile in order to catch the rain?A.30m.ph B .45m.ph C.60m.ph D.90m.ph
问题描述：
智力测验题（英语）
I only have two minutes to catch the train,but there are two miles from my house to the train station.If I go the first mile at the rate（速率)of 45 miles per hours ,at what rate must I go the second mile in order to catch the rain?
A.30m.ph B .45m.ph C.60m.ph D.90m.ph
答
在前一英里中,速度是3/4,用时4/3分,后一英里需用时2/3分,计算,速度是90英里/小时,选D