Question

Seraphina is driving two hours to visit her family. For the first hour, she traveled at a speed of 60 miles per hour. Then, in the second hour, she traveled at a speed of 68 miles per hour. What is the percentage increase of Seraphina's speed? If necessary, round to the nearest tenth of a percent.

Answer 1

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.