Write a division equation that has a solution of 42

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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?

Need solving this second acceleration problem.