Answer:
hope it helps.
stay safe healthy and happy.
13.5/3 = 4.5
He hiked for 4.5 hours.
I think this might help but sorry if it does not but I hope it does :) :D - https://learnzillion.com/lesson_plans/5701-writing-an-explicit-formula-for-the-graph-of-an-exponential-relationship/