Respuesta :

Step 1. speed = distance/time 

Step 2. Given, 1 hour = 60 minutes then 45 minutes* 1 hour/60 minutes = 0.75 hour 

Step 3. Speed or average rate = 3 miles/(0.75 hour)=12/3 mph= 4 mph 


Step 4. ANSWER: The average rate is 4 miles per hour.
Neuron
To calculate your question, we need to do the following. 

Lauren ran for 45 minutes. 

We first calculate what percentage/fraction 45 minutes is of 60 minutes:

45/60 = 3/4
45 minutes is 3/4 of one hour

We also know she traveled 3 miles in only 45 minutes. Now we have to calculate how much she would travel in the remaining 15 minutes.

What we simply do is calculate the speed = distance/time:

The 3 miles / (3/4) h = 4 miles

This then tells us tthat she would travel 4 miles per hour. 

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