6. (7 marks] Suppose a migrating bird flies at a constant altitude of 5 km, with a velocity of 42 kmfh. At time t = 0 the bird passes directly above a radar station. where t is measured in hours. {a} How fast is the distance behueen the bird and the radar station changing after 10 minutes? Round your final answer to 2 decimal places and provide units. (b) How fast is the distance between the bird and the radar station changing at time t = 0. Le. when the bird is directly above the radar station? Is this reasonable? Explain briey