A bird leaves its nest and travels 18 miles per hour downwind for x hours. On the return trip, the bird travels 3 miles per hour slower and has 5 miles left after x hours. a. What is the distance of the entire trip?
? miles

b. How long does the entire trip take?
? hours
? minutes
? seconds

The answer for a is 60 miles and the answer for b is 3 hours, 40 minutes, and 0 seconds. Explain how this is correct. 30 point question, please answer soon.