Answer:
60 feet
Step-by-step explanation:
If the length of the smallest string is x, we know that the first string is equal to 2x and the third is equal to 3x, the sum of these 3 parts gives us 6x, that is, the total lenght of the string, therefore 6x = 120, then [tex]x=\frac{120}{6}[/tex], replacing x we have [tex]3x=3*\frac{120}{6}=60[/tex], the length of the longest rope is 60 feet