The time it took car P to travel 600 miles was 2 hours less than the time it took car R to travel the same distance. If car P’s average speed was 10 miles per hour greater than that of car R, what was car R’s average speed, in miles per hour ？（）
A: 40
B: 50
C: 60
D: 70
E: 80
A: 40
B: 50
C: 60
D: 70
E: 80
举一反三
- Two cars left the same town traveling in the same direction. Car A traveled 40 miles per hour and left at 3:20. Car B traveled 50 miles per hour and left at 4:40. At what time will car B catch up with car A A: 10:00 B: 9:00 C: 8:40 D: 7:20 E: (E) 6:10
- This kind of car can run _____ the speed of 80 miles per hour. A: at B: by C: to D: on
- A car travels at a rate of 50 miles per hour.How long will it take to travel 300 miles（） A: 250hours B: 6hours C: 1/6hours D: 15000hours
- The maximum speed of this car is 150 miles per hour. A: highest B: lowest C: minimum D: supreme
- 在校园里，车速被限制在每小时10英里。( be limited to) On campus, the car speed 10 miles per hour.