Harlow can bicycle at a rate of 18 miles per hour. how many hours would it take him to bicycle a stretch of road that is 450 miles long?

Velocity = distance / time

Velocity = 18 miles per hour

Distance = 450 miles

18 = 450 / time

Time = 450 / 18

Time = 25 hour

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)