Use the graphic map scale (in nautical miles [nm]) to estimate the distance from the center of the storm south of chicago (at 40° n, 90o w) to the east coast of the united states (measure along the 40th parallel). 3. (a) nautical miles assuming that the storm travels to the east at a speed of 30 knots, how many hours will it take for the center (b) of the low to reach the east coast?