A motorboat maintained a constant speed of 16 miles per hour relative to the water in going 15 miles upstream and then returning. The total time for the trip was 2.0 hours. Use this information to find the speed of the current.

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Which one ? is the answer and how to find this answer

X+ y = 5 ; x - y =3 solve using linear combination