Question 229355
Let x be the shorter spans.
Let y be the longer span.
x=y/2
2x+y=3,560 Noqw replace x in this equation with (y/2).
2(y/2)+y=3,560
2y/2+y=3,560
y+y=3,560
2y=3.560
y=3,560/2
y=1,780 ans. for the longer span.
x=1,780/2
x=890 ans. for the 2 shorter spans.
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x/2+x/2+x=3560
2x=3560
x=3560/2
x=1780 m is the length of the long spans.
1780/2=890 m is the length of the 2 shorter spans.
Proof:
890+890+1780=3560
3560=3560
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I always try to take the shortest method to get the solution.