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a car can go three feet in one second how long it take to drive 21 feet

Sagot :

Answer:

7 seconds

Explanation:

In 1 second, the distance covered by the car is 3 feet.

We know that:

[tex]\text{Average Speed=}\frac{\text{Distance}}{\text{Time}}[/tex]

Therefore, the average speed of the car will be:

[tex]S\text{peed}=\frac{3}{1}=3\text{ ft per second}[/tex]

We want to determine the time when:

Distance = 21 feet

Substitution into the formula for average speed gives us:

[tex]\begin{gathered} 3\text{ ft per second = }\frac{21}{\text{Time}} \\ 3\times\text{Time}=21 \\ \text{Divide both sides by 3} \\ \text{Time = 7 seconds} \end{gathered}[/tex]

Therefore, it takes 7 seconds to drive 21 feet.

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