5) engineers want to design an auxiliary pipeline from a new natural gas source; 3 km from the main pipeline, to a power plant located 10 km down the main pipeline, in the least amount of time (see figure 1). if the oil can flow 10 km/hr along the auxiliary pipeline (ob) and 15 km/hr along the main pipeline (ap), where should the engineers join the auxiliary pipeline to the main pipeline to get the gas to p as soon as possible? figure 1 natural gas source power plant 10-x 10 5) (a) 0 (b) 0.89 (c) 0.97 (d) 6/n5 (e) none of the above