The slope of a horizontal line is always 0 because all its points have the same y-coordinate
![D.~\frac{1}{2}~and~\frac{3}{2}](https://tex.z-dn.net/?f=D.~%5Cfrac%7B1%7D%7B2%7D~and~%5Cfrac%7B3%7D%7B2%7D)
Like fractions are fractions with the same <em>denominator</em>. They are not necessary the same value.
S=d/t so in this case it's 75/12 which is 6.25. Round it and you got 6 miles per hour.
1 mile = 5,280 feet.
Convert the 0.25 mile to feet:
0.25 miles = 0.25 x 5,280 = 1,320 feet.
Add the soda shop distance to this:
1,320 + 900 = 2,220 feet.
Total distance is 3 miles and 2,220 feet