PLEASE HELP! WILL MAKE YOU THE BRAINLIEST IF YOU ARE THE FIRST PERSON

According to formula
Time in hours = d/2 + e/2
where d=distance in miles
e=difference in elevation in 1000 ft.
Therefore
d=9 miles
e=9000 ft/1000 ft = 9
Time in hours
= d/2 + e/2
= 9/2 + 9/2
= 9 hours.