A 6000-pixel linear pushbroom sensor with 0.010-mm square pixels and a 50-mm focal length lens is flown in an aircraft 3000 meters above the terrain at 900 km/hr. At what line rate must the sensor be read out so that the image is neither over-sampled nor under-sampled (the GSD is exactly equal to the aircraft's forward motion during the line sample time)? What is the width of the coverage strip?