单选题 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?
2. 8
181/2
211/2
22
24
单选题 If x= a/3+b/32+c/33, when a, b, and c are each equal to 0 or 1, then x could be each of the following EXCEPT ______.
1/27
1/9
4/27
2/9
4/9
单选题 If x is an integer and y=4x+3, which of the following cannot be a divisor of y?
5
6
7
9
23