6. Figure below gives the mileage of the feasible links connecting nine offshore natural gas wellheads with an inshore delivery point. Because wellhead 1 is the closest to shore, it is equipped with sufficient pumping and storage capacity to pump the output of the remain-ing eight wells ta the delivery point. Determine the minimum pipeline network that links the wellheads to the delivery point. (10 points) (SE 2000 1300 1100 1000 CH 200 DE DC 2000 2600 780 900 1400 1300

Fig: 1