What's the distributive property for 68 divided by 4

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

Nell has a sales clerk job that pays $12 per hour for regular gas work hours. she gets double time for any hours over 40 that she works in a week. how many hours did nell work if her weekly pay was $744

Twelve less than a number is at most 20