It is simply 60:40. You could simplify that to 3:2.
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1 hour : 40 minutes = 60 minutes : 40 minutes = 60:40 = 3:2 = 1.5, as a fraction.
The angles are: 40, 60 and 80 degrees
Perimeter = 40+40+60+60 = 200 units
60 x 40 = 2400 40 x 60 = 2400 4800 / 100 = 48
THE ANSWER IS 40 BECAUSE IF YOU MULTIPLY THEM BY 10x4 AND IT WILL EQUAL 40