单选题
If Jason traveled 30 miles in 6 hours and Katie traveled three times as far in half the time, what was Katie's average speed, in miles per hour?
- (A) 5
- (B) 15
- (C) 30
- (D) 45
- (E) 90
【正确答案】
C
【答案解析】You are given that Jason traveled 30 miles in 6 hours and that Katie traveled three times as far in half the time; Katie traveled 30×3, or 90 miles, in[*] or 3 hours. Therefore, Katie traveled [*], or 30 miles per hour.