The equation of a circle is (x-3)^2+(y+8)^2=36. relative to the standard equation of a circle (x^2+y^2=r^2), how has this circle been shifted? what is the radius of the circle?

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance