A car is driving on  a circular track with radius 1 km. In the most southern point of the track there's a radar. On a given point the car is 1/2 km away from the radar and the distance between the car and the radar is increasing by 50 km/h. How fast is the car driving north?  The question only asks for the north/south movement, even though it'll also have a movement east/west

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A: A 12 foot ladder is leaning against a wall. If the top slips down the wall at a rate of 4ft/s.

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Q: At noon, ship A is 180 km west of ship B. Ship A is sailing east at 40 km/h and ship B is sailing…

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Q: Two cars start moving from the same point. One travels south at 48 mi/h and the other travels west…

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