Distance Clinton County, Michigan, is mostly flat farmland partitioned by straight r...

Distance Clinton County, Michigan, is mostly flat farmland partitioned by straight roads (often gravel) that run either north/south or east/west. A tractor driven north on Lowell Road from the Schafers farm’s mailbox is

north of Howe Road t minutes after leaving the farm’s mailbox.

a. How far is the Schafers’ mailbox from Howe Road?

b. Use the limit definition of the derivative to show that the tractor is moving at a constant speed.

c. How quickly (in miles per hour) is the tractor moving?