Answer:
18
Step-by-step explanation:
Khan Academy
Answer:
60
Step-by-step explanation:
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The answer is C. It has a high density
The average speed = (speed 1 + speed 2)/2
the average speed = (80/10 + 100/20)/2
the average speed = (8 + 5)/2
the average speed = 13/2
the average speed = 6.5 km/minute