Respuesta :
[tex] \frac{3ft}{1sec} = \frac{21ft}{xsec}
\\ Cross\ multiply
\\ 3x = 21
\\ (3x)/3 = 21/3
\\ x = 7seconds[/tex]
The car will take 7 seconds to travel 21 feet if an average speed of 3 feet per second.
What is the distance?
Distance is a numerical representation of the distance between two items or locations. Distance refers to a physical length or an approximation based on other physics or common usage considerations.
We have:
Fuads model racing car drives at an average speed of 3 feet per second.
We know,
Time = distance/speed
Time = 21/3 = 7 seconds
Thus, the car will take 7 seconds to travel 21 feet if an average speed of 3 feet per second.
Learn more about the distance here:
brainly.com/question/26711747
#SPJ2