1.  Latitude Assuming that the earth is a sphere of radius 4000 miles, what is the difference in latitude of two cities, one of which is 325 miles due north of the other? (Latitude lines on the earth run parallel to the equator and measure the angles from the equator to points north or south of the equator.)

2.  Wheel Revolutions A car is moving at the rate of 45 mi/hr (66 ft/sec), and the diameter of each wheel is 2 feet. Find the number of revolutions per minute that the wheels make and the number of radians per second generated by a line segment from the center to the circumference of each wheel.