Answer:32
Step-by-step explanation:
(20)-(-12)=20+12=32
6x +3
6 x 4 = 24
24 + 3
27
Hope this helps You!
Using the relation between velocity, distance and time, it is found that her average speed for the final 30 miles is of 55.56 mph.
<h3>What is the relation between velocity, distance and time?</h3>
Velocity is distance divided by time, that is:
![v = \frac{d}{t}](https://tex.z-dn.net/?f=v%20%3D%20%5Cfrac%7Bd%7D%7Bt%7D)
Simone travels 90 miles at an average speed of 40 mph, hence the time is given by:
![t_1 = \frac{90}{40} = 2.25](https://tex.z-dn.net/?f=t_1%20%3D%20%5Cfrac%7B90%7D%7B40%7D%20%3D%202.25)
She then travels a further 30 miles, with an average speed for the journey of 43 mph. Hence, she traveled 90 + 30 = 120 miles, and the total time is given by:
![t = \frac{120}{43} = 2.79](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B120%7D%7B43%7D%20%3D%202.79)
Hence, in the second part, she traveled 30 miles in 2.79 - 2.25 = 0.54 hours, so the velocity is given by:
![v = \frac{d}{t} = \frac{30}{0.54} = 55.56](https://tex.z-dn.net/?f=v%20%3D%20%5Cfrac%7Bd%7D%7Bt%7D%20%3D%20%5Cfrac%7B30%7D%7B0.54%7D%20%3D%2055.56)
Her average speed for the final 30 miles is of 55.56 mph.
More can be learned about the relation between velocity, distance and time at brainly.com/question/24316569
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