Answer:
45.7 meters
Explanation:
15 = 6 + 7y
9 = 7y
y = 1.3
The two lengths are still the same, so you can set the two parts equal to the whole. Now that you have y you can substitute it in and add all the sides together.
3y + 7y + 3y + 6y + 6 +15 = P
3(1.3) + 7(1.3) + 3(1.3) + 6(1.3) + 6 + 15 = P
P = 45.7 meters