Aro diagrams his river rafting trip, estimating the time it will take him to paddle upstream against the current, and then back downstream with the current. his campsite destination is 5.2 miles upstream. determine how fast aro can paddle and how fast the river water is moving. round to the nearest hundredth as needed. upstream: downstream: let x be the speed of aro’s paddling and let y be the speed of the river. upstream: 1.04 = x – y downstream: 2.08 = x + y aro can paddle at a speed of miles per hour. the river’s speed is miles per hour.