Sarah the cheetah ran 100 meters at a speed of 16.8 meters per second. An olympian ran the 100-meter dash in 9.6 seconds. How much faster was Sarah the cheetah’s speed, to the nearest tenth of a meter per second?

The Olympian’s speed was 100 ÷ 9.6 ≈ 10.4 meters per second. Subtract that from Sarah’s speed: 16.8 − 10.4 ≈ 6.4 meters per second. So Sarah was faster by 6.4 meters per second, choice C.

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