Atruck driver drove 10 miles in 1 3/4 hours. what is the speed of the truck in miles per hour?

Distance driven by the truck driver = 10 miles
Time taken = 1 3/4 hours
                   = 7/4 hours
So
10 miles is driven by the truck driver in = 7/4 hours
1 mile driven by the truck driver in = (7/4)/10 hours
                                                       = 7/40 hours
So the speed of the truck in miles per hour is 7/40 miles per hour. It can also be written as 0.175 miles per hour. I hope the procedure is clear to you. In future you can attempt such problems on your own without requiring any help from outside.

Set up a proportion.

10/1.75 = 1/x

Now cross multiply.

10*x = 1.75*1
10x = 1.75

10x/10 = 1.75/10 
x= 1.75/10
x= 0.175

0.175 = 7/40

X = 7/40

Final  7/40 miles per hour