Question

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

Answer 1

7 seconds

Step-by-step explanation:

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

We know that:

`\text{Average Speed=}\frac{\text{Distance}}{\text{Time}}`

Therefore, the average speed of the car will be:

`S\text{peed}=(3)/(1)=3\text{ ft per second}`

We want to determine the time when:

Distance = 21 feet

Substitution into the formula for average speed gives us:

`\begin{gathered} 3\text{ ft per second = }\frac{21}{\text{Time}} \\ 3*\text{Time}=21 \\ \text{Divide both sides by 3} \\ \text{Time = 7 seconds} \end{gathered}`

Therefore, it takes 7 seconds to drive 21 feet.