First, let's find the scale of the smaller to the bigger triangle:
6:6+4 = 6:10 = 3:5
3/5 = x/2
6 = 5x
x = 6/5
A few of them are similar because of the sizes.
$1.20 is the answer because when you add it together and then divide the total by your answer you get that
I believe 900 meters your welcomes