问题
单项选择题
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.6：10
答案
参考答案：A