Three fifths of the length of a piece of rope is used for the first time, and the rest is one-half of the length used. How long is the length of this piece of rope?

Three fifths of the length of a piece of rope is used for the first time, and the rest is one-half of the length used. How long is the length of this piece of rope?

3/5+3/5+1/2 =17/10 =1.7m