An airline passenger is planning a trip that involves three connecting flights that leave from airports A,B and C respectively. The first flight leaves airport A every hour, beginning at 8:00 AM., and arrives at airport B 21/2 hours later. The second flight leaves airport B every 20 minutes,beginning at 8:00am., and arrives at airport C 1 1/6 hours later. The third flight leaves airport C every hour, beginning at 8:45 am. what is the least total amount of time the passenger must spend between flights if all flights keep to their schedules?
1 hr 15 min
2hr 20 min
3 hr 40 min
I chose C but that's incorrect.