问题
单项选择题
Harry started a 6-mile hike with a full 10-cup canteen of water and finished the hike in 2 hours with 1 cup of water remaining in the canteen. If the canteen leaked at the rate of 1 cup per hour and Harry drank 3 cups of water during the last mile, how many cups did he drink per mil during the first 5 miles of the hike ？（）
A.A
B.B
C.C
D.D
E.E
答案
参考答案：A
解析：
前五英里喝的水的杯数为：总量10杯减去最后剩的1杯，最后1小时喝的3杯以及整个旅程中漏掉的2杯，即为10-1-3-2=4杯。所以Harry前五英里平均每英里喝的水量为[*]杯。