Pls someone help me with this question

AND PLS NO LINK!!​

On saturday morning, calls arrive at ticketmaster at a rate of 108 calls per hour. what is the probability of fewer than three calls in a randomly chosen minute?

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

How many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.