(Rate Problems – Chase and Meeting STD)
The distance between A and B is 610km. Alonzo left A for B at a speed of 90km per
hour at 8:00 am. At 9:30 am, another person Caroline left B for A at a speed of 100km
per hour. How much time after Caroline set off will it take when they meet each other?
答案：2.5 hrs