Answer:
The unit rate is 20.8 ft/ sec.
Step-by-step explanation:
It is given that the displacement of 644.8 ft in 31 s.
When the rate is define in the quantity of 1, then it is called unit rate.
In 31 s the displacement is 644.8 ft.
[tex]31 \text{ s}=644.8 \text{ ft}[/tex]
Divide both sides by 31,
[tex]\frac{31}{31} \text{ s}=\frac{644.8}{31} \text{ ft}[/tex]
[tex]1 \text{ s}=20.8 \text{ ft}[/tex]
For one second the value of the displacement is 20.8.
Therefore the unit rate for 644.8 ft in 31 s is 20.8 ft/sec.
