Let x = one piece of rope. Let x/2 be the shorter piece.
x + x/2 = total length = 93
Multiply the first x term by 2/2 to get 2x/2
2x/2 +x/2 = (2x +x) /2 = 3x/2 = 93
Multiply both sides by 2
3x = 186 divide both sides by 3
x = 62 ft and the short rope is therefore 31 ft