问题
单项选择题
A particular rocket car can travel for sustained periods at a maximum speed of 240 miles per hour. How many minutes would it take this rocket car to travel 86 miles ？（）
A. 2.8
B. 18 1/2
C. 21 1/2
D. 22
E. 24
答案
参考答案：C
解析：
A car traveling at 240 mph will cover 240760 = 4 miles every minute. 86 miles divided by 4 miles per minute=21 1/2 minutes.
