Which expression calculates the speed in meters per second of an object that travels a distance of 40 m every 10 s?

40⋅10

10 ÷ 40

40 ÷ 10

40 + 10

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