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Answer:
Step-by-step explanation:
percent change = (amount of change)/(original amount) × 100%
... = (73 -60)/60 × 100%
... = 13/60 × 100%
... ≈ 0.216667 × 100%
... ≈ 21.7%
Sarah's speed in the second hour was about 21.7% greater than in the first hour.