A bicycle is traveling at 21 miles per hour. How many feet will it cover in 30 seconds? Round your answer to the nearest tenth of a foot.

Your teacher may want you to delete the comma.

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Explanation:

Let's start with these facts

The main takeaways here are that 1 mile = 5280 ft and 1 hr = 3600 sec.

We'll use those two facts to then convert from mph to feet per second.

This value is exact.

Since the bike is moving at exactly 646.8 ft per second, this means that after 30 seconds, the bike has traveled exactly 646.8*30 = 19,404 feet

I'm using the formula:  distance = rate*time

Side note: 19,404 feet is exactly equal to 3.675 miles (divide by 5280 to convert from feet to miles).

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step-by-step explanation: