So for this problem, inches and feet is something we know can fit into each other. 12 inches = 1 foot. To get the area in inches, multiplying 10x6 = 60 inches squared. When we divide that by 12 to get the amount of feet, the answer is 5 ft squared. 60/12 = 5 Then we would take the 5 and divide 540 by 5 to get the amount of square kilometers in each foot. 540/5 = 18 So in 1 foot, there are 18 square kilometers.
I hope this helped and that I got the correct answer for you as well :)
