Astore is having a 20% off sale. the sale price of an item with price p is p – 0.2p. what is an equivalent expression?

Math it's appreciated. (picture provided)

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?

Yo need asap pls ! markin da brainiest too !