Rodney bought a 25- pound bag of dog food . his dog ate 10 2/5 pounds of the food in the first month and 10 4/5 pounds of the food in the second month. how much dog food , in pounds, was remaining in the bag at the end of the two months ? show your work

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?