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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?
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?
and the other walks northeast at 
. How fast is the distance between the people changing after 
minutes?
long and the hour hand is 
long. How fast is the distance between the tips of the hands changing at one o'clock?