The photographer just doubled the size of the 5 x 8 in photo
4 1/4 + 1 1/8 =
4 2/8 + 1 1/8 = 5 3/8
2 7/10 + 4 1/5 =
2 7/10 + 4 2/10 = 6 9/10
3 1/2 + 5 1/4 =
3 2/4 + 5 1/4 = 8 3/4
1 1/8 + 3 3/4 =
1 1/8 + 3 6/8 = 4 7/8
2 3/5 + 3 7/10 =
2 6/10 + 3 7/10 = 6 3/10
They’re the same.
Give them common denominators by looking at their least common multiples. 6 and 21 are the denominators and they have to be the same to compare. Their least common multiple is 42.
So 1 4/6 will turn into 1 28/42. I know this because their least common multiple is 42. So I multiplied the 6 by 7 to get 42 as the denominator and you must also multiply the numerator by 6.
1 14/21 will need to be multiplied by 2 to get a denominator of 42. It will turn into 1 28/42. Both simplify down to 1 2/3.
Assuming the control tower is at sea level, the distance is 8463 feet.