allerySpeed rises steadily from 20 to 50 km/h in 5 seconds. What is the rise per second?
A4 km/h
B5 km/h
C6 km/h
D10 km/h
Answer & Solution
Correct answer: C. 6 km/h
The rise is 30 km/h across 5 seconds, so the slope is 6 km/h per second.
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