Level 1-2 1. Sally picked 5 apples, but she needs 12 to bake 3 apple pies. How many more apples does Sally need? (To access the graph, simply double click on the image and place the point where it should be). I need the set notation ☠

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?