A racing car covers A to B at a constant speed of 20 km/hr and returns from B to A at a constant speed of 30 km/hr. What is the average speed and the average velocity of the car for the entire journey, respectively?
A
20 km/hr, 20 km/hr
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B
0 km/hr, 24 km/hr
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C
24 km/hr, 0 km/hr
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D
25 km/hr, 0 km/hr
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