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A plane flying with a constant speed of km/h passes over a ground radar station at an altitude of km and climbs at an angle of degree. At what rate is the distance from the plane to the radar station increasing a minute later?
Two people start from the same point. One walks east at and the other walks northeast at . How fast is the distance between the people changing after minutes?
The minute hand on a watch is long and the hour hand is long. How fast is the distance between the tips of the hands changing at one o'clock?