Rohan went to his friend Sohan's house. The distance between Rohan's house and Sohan's house is $1.75 \ km.$ After some time Rohan came back to his house. Then the total distance he walked is$.........$
$1.$ Pole $A$ is twice the length of pole $B.$ Pole $C$ is $260 \ cm$ shorter than pole $A.$ If pole $C$ is $1040 \ cm$ long, what is the total length of the three poles?