Abird leaves its nest and travels 18 miles per hour downwind for xx hours. on the return trip, the bird travels 3 miles per hour slower and has 5 miles left after xx hours. a. what is the distance of the entire trip? miles b. how long does the entire trip take? hours minutes and seconds

 bird leaves its nest and travels 20 miles per hour downwind for x hours.
On the return trip, the bird travels 4 miles per hour slower and has 6 miles left after x hours.
:
A) What is the distance of the entire trip
dist = speed * time

d = 20x + 16x + 6
d = 36x + 6 miles
:
B) How long does the entire trip take? 
time = dist/speed
t = 2x + 
t = 2x +  hrs
I think that this is the answer, but I am not . sure

X=3 and y=4 is the answer