Caitlyn left the park traveling 6 mph. Then, 3 hours later, Whitney left traveling the same direction at 15 mph. How long will Whitney travel before catching up with Caitlyn?

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth