Adam's school is 12 miles from his house. It takes his older brother 20 minutes to drive him school. If adam's brother dives s mph faster than usual, how fast will they reach the school?

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