A man is driving a car at a speed of 45 kph along a straight line passing 20 m in front of a 15 m high monument. At what rate is his distance from the top of the monument changing 4 seconds after he passed in front of the monument? Select one: O a. 40.25 kph O b. 42.38 kph Oc. 38.65 kph O d. 32.82 kph

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