I need help i jst dont get it

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

Im literally having a mental breakdown