A freight train leaves Austin at 60t km/h. Two hours later, an Amtrak train leaves. \Austin on a parallel track headed in the same direction at 90 km/h. How many hours will it take for the Amtrak to catch the freight train?

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?

Square a has a side length of (2x-7) and square b has a side length of (-4x+18). how much bigger is the perimeter of square b than square a?and show all work! you so

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