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When Helen jogs, every $20$ minutes she checks the total distance she traversed. One day, the first time she checked, Helen had jogged a distance of $2.5$ miles, the second time she checked, she had jogged a total distance of $3.8$ miles, and the third and final time that she checked, Helen found out that she jogged a total distance of $5.2$ miles. What is the difference between her average speeds, in miles per hour, during the first $20$ minutes of jogging and the last $20$ minutes of jogging?

 Jun 2, 2024
 #1
avatar+129487 
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Avg speed =  Distance / Time

 

Avg speed first time =  2.5/(1/3)  = 7.5 mph

 

The last time she checks she has run (5.2 - 3.8)  =  1.4 miles in 20 min = 1.4 / (1/3) =   4.2 mph

 

Difference in avg speeds =  7.5 - 4.2  =  3.3  mph

 

cool cool cool

 Jun 2, 2024

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