To get you started:
the flag is 5 stories in length each story is 120 inches 120 x 5 = 600 inches in length (fly)
the hoist is in a ratio fly / hoist = 1.9 /1 1.9 / 1 = 600/ hoist so the hoist (width) = 600/1.9 = 315.8 inches
Now you can calculate the perimeter.
Union hoist (blue width) 7/13 of total hoist (it covers 7 of the equal width stripes....hence 7/13)
Union hoist = 7/13 x 315.8 = 170 inches
Union fly (width) = .76 (315.8) = 240 inches
you should be able to calculate the area of the Union now,,,,,
Each stripe is 1/13 of the hoist = 1/13 x 315.8 = 24.3 inches wide
now you should be able to calculate the fly of the short and long stripes to calculate the area of red stripes