Problem: Show all steps of your work for full credit. sen loodos and tol amer as 11. A salmon fishing boat on a BC river travelled upstream in 4 h. returning downstream at the same speed, it took 3 h. Find the speed of the fishing boat in still water and the speed of river's current if distance is 72 km. ( I/ 4 ) (Hint: Distance =Speed x time) 12. A (9, 5) and B (5, -9 ) are two points on a circle centered at the origin. a) Determine an equation for the circle. (K/U/3) b) What is its radius. (K/U/1) b) Determine the midpoint C of chord AB. (K/U/1)