We know that if the radio of the length and breadth is 3:4, than the length and breadth should have lengths 3x and 4x respectively. Therefore, the area of this rectangular park is 3x * 4x = 12x^2 = 4800. We can solve this by dividing each side by 12 to get x^2 = 400. We know that 20^2 = 400, so we know x = 20. The length and breadth is 3x and 4x, so plugging 20 in, we know that our length and breadth are 60 meters and 80 meters. Never forget UNITS!
