Arlo baked three identical cakes. He cut the first cake into 8 equal pieces, the second cake into 6 equal pieces, and the third cake into 8 equal pieces as shown. The shaded parts represent the pieces that were eaten. Which number sentence about the shaded parts of the diagram is true?

A car and a truck each begin a trip of 1 mile from the park to the store. Which number sentence correctly compares the part of a mile each vehicle has traveled?