A car's speed increases from 60 km/h to 75 km/h.
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A car's speed increases from 60 km/h to 75 km/h. By what percentage has its speed increased?
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Answer: A. 25%
Percentage increase = (75 - 60) / 60 * 100% = 15 / 60 * 100% = 25%.
Step-by-step Derivation:
Step 1: Increase in speed = 75 - 60 = 15 km/h.
Step 2: Percentage increase = (15 / 60) * 100% = 25%.