Stela's lesson would end at 5:20, because 4:30 is the start time of her class and it is 50 minutes long so you want to add and like this
4:30
+
50
----------------
4:80
since there are 60 minutes in an hour you would make it like 80-60 which is 20 so u would do 5:00 + 20 minutes
Your welcome, pls make this the brainliest and have a nice day
