Question 1121553
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You calculated the length of ONLY ONE cable which is at the distance of 6 meters from the tower.


You need to calculate the corresponding lengths for EVERY cable.


The distance between the towers is 30 + 30 = 60 meters; hence, there are  {{{60/6-1}}} = 9  cables, in all, of different lengths.


Make a sketch - it will help you a lot.
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Also, as everybody who saw a suspension cable bridge (in a real life, in a photo, in a picture, in a video) knows  
that the suspension cables are located/placed at both sides of the bridge.


So, when you calculate the total length of the cables at one side of the bridge, you must then DOUBLE it (!)