It takes 3 hours for Marty and Cora to weed a garden. How long will it take 6 people to weed the same garden if they all work at the same constant rate?

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad