A canoe travels 7 miles per hour downstream and 1 mile per hour upstream. Let x represent the canoe's speed with no water current (in still water) and y represent the speed of the water current, in miles per hour. Then the situation can be represented by this system of equations: Choose the two correct options. x+y=7 x - y = 1 A. The speed of the canoe in still water is 3 miles per hour. B. The speed of the water current is 4 miles per hour. C. The speed of the canoe in still water is 4 miles per hour. D. The speed of the water current is 3 miles per hour.​