When paddling a canoe in moving water, you travel at a different rate than paddling in still water. The direction you are traveling determines whether you will go faster or slower.
The seeped at which the water is moving also makes a difference in the rate you are able to travel. The speed at which the water in a river moves varies with the amount of the water passing through it.
suppose you are a river guide who transports campers to a campground located 7 miles down river from a local ranger station. It is only 7 miles down river from a local ranger station. It is only accessible by non-motorized water craft. So you can use canoes. You transports campers and their equipment to the campground, unpack their belongings (which takes about 1 hour), and head back to the station.
you can paddle 3 miles per hour in still water, determine the time it would take to make a round trip to and from the campground for any current.
As a guide you want to be able to make the round trip in less than 10 hours so you can take campers to the campground, drop them off (which takes about 1 hour) and return to the ranger station before it gets dark. At what speed could the river be flowing if you are to successfully make the trip in the allotted time?