Aliza needs to run at a rate faster than 8.8 feet per second in order to exceed her fastest time in a race. After running for 15 minutes, her coach determines that she is running at an average rate of 5.8 miles per hour. He converts the average rate to feet per second as shown below:

He concludes that she is not running fast enough to exceed her fastest time.

Question

Aliza needs to run at a rate faster than 8.8 feet per second in order to exceed her fastest time in a race. After running for 15 minutes, her coach determines that she is running at an average rate of 5.8 miles per hour. He converts the average rate to feet per second as shown below:

He concludes that she is not running fast enough to exceed her fastest time.

savannah2020 · Answer

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Mercury · Answer

next time please post the answer choices (more than 1 may apply)

- He used an incorrect time ratio converting hours to minutes

- He incorrectly concluded that she is not running fast enough

- His units do not cancel

- He used an incorrect distance ratio converting miles to feet

- He cannot determine her average rate in miles per hour after only 15 minutes

major hint: notice how he used the conversion factor 1 hr/15 minutes, even though 1 hour is 60 minutes not 15 minutes. correct this error and see whether she meets the minimum speed requirement of 8.8 ft/sec

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