Answer
420 ft
Work Step by Step
Total Length of each cable:
12 x 8$\frac{1}{2}$ ft = 12 x $\frac{17}{2}$ = 102 ft
7 x 18$\frac{1}{2}$ ft = 7 x $\frac{37}{2}$ = $\frac{259}{2}$ft
24 x 1$\frac{3}{4}$ ft = 24 x $\frac{7}{4}$ = 42ft
12 x 6$\frac{1}{2}$ ft = 12 x $\frac{13}{2}$ = 78ft
2 x 34$\frac{1}{4}$ ft = 2 x $\frac{137}{4}$ = $\frac{137}{2}$
total length of the cable = 102 ft +$\frac{259}{2}$ft + 42ft + 78ft + $\frac{137}{2}$
= 222 + $\frac{396}{2}$
= 222 + 198
=420 ft
