Final answer:
Caden started his hike at 11:50 A.M. and, after the full duration of the hike and time spent at the viewpoint, he would have returned by 3:10 P.M.
Step-by-step explanation:
If Caden started his hike at 11:50 A.M., and it took him 2 hours and 35 minutes to hike to the viewpoint, we first need to add this time to the starting time.
To do that, one can convert 2 hours and 35 minutes into minutes only, which gives us 155 minutes.
When we add those 155 minutes to 11:50 A.M., we get 2:25 P.M.
Then we add the 15 minutes he spent enjoying the view which brings us to 2:40 P.M.
Finally, we added the 30 minutes for the hike back, resulting in Caden getting back at 3:10 P.M.