小学五年级天天练：

　　难度：★★★★

　　小学五年级奥数天天练：相遇

　　甲、乙两人同时从A、B两地相向出发，甲的速度是乙的速度的1.5倍，到达对方出发点后立即返回，如果第一次相遇点和第二次相遇点相距相距300米，那么A、B两地的距离为多少米?

　　难度：★★★★★

　　小学五年级奥数天天练：英语

　　Dave can answer each problem on a certain test in 6 minutes. Michael can answer each problem in 1 minute. Suppose Michael rests for two hours in the middle of answering the problems but Dave works straight through the test without stopping. Suppose further that they finish the test at the same time. How long did it take Dave to answer all the problems?

　　Answer: ________ minutes