Please help me with this

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?

Micheal is 4 times as old as brandon and is also 27 years older than brandon. how old is micheal

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?