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Sagot :
Answer: 4 miles per hour.
Step-by-step explanation:
Total distance ran by Joy= 13 miles
Total time taken by Joy =3 and 1/4 hours
[tex]=3+\frac{1}{4}\ hours\\=\frac{13}{4}\ hours[/tex]
The average rate of running= [tex]\frac{\text{total distance}}{\text{time taken}}[/tex]
[tex]\frac{13}{\frac{13}{4}}=\frac{4}{1}=4\text{ miles per hour}[/tex]
Hence, her average rate=4 miles per hour.
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