The question below states that at noon, Deirdre and Donovan were 1100 miles apart? According to the question, Deirdre boarded the train at 12pm and Donovan 2 hours later. Is there a typo in this book or am I missing something?

Deirdre and Donovan are in love and will be meeting in Kansas City to get married.

Deirdre boarded a train at noon traveling due east toward Kansas City. Two hours later, Donovan boarded a train traveling due west, also heading for Kansas City, and going at a rate of speed 20 miles per hour faster than Deirdre. At noon, they were, 1,100 miles apart. At 9 pm. they, they both arrived at Kansas City. How fast are they traveling?

Distance of Deirdre from Kansas City + Distance of Donovan from Kansas City = 1,100

Rate x Time + Rate x Time = 1,100

Thanks in advance.