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Answer: She needs to walk 5 miles an hour
There's two numbers 2.5 miles and 0.5 hours, you divide that, and you get the number 5, so that means, 5 miles an hour
She needs to walk at a speed of 4 miles/hour to reach the destination in 45 minutes.
What is Speed?
Speed is the ratio of the total distance covered by an object and the required time to cover that by that object. It is also called Velocity.
[tex]Velocity=\frac{Distance}{Time}[/tex]
Velocity is the measurement which shows an object is how fast.
In this given problem,
The total distance Danielle needs to cover by walking is 3 miles.
She needs to reach the destination in 45 minutes
We know that,
60 minutes = 1 hour
1 minute = [tex]\frac{1}{60}[/tex] hour
45 minutes [tex]=\frac{45}{60}=\frac{3}{4}[/tex] hours
So she has to have the velocity/speed of [tex]=\frac{3}{\frac{3}{4}}=3\times\frac{4}{3}=4[/tex] miles/hour
Hence she needs to walk 4 miles/hour.
Learn further about Speed here -
https://brainly.com/question/14101278
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