Ethan and Kyler need to stuff 370 envelopes. Ethan can stuff 20 envelopes in 4 minutes, Kyler can stuff 12 envelopes in 5 minutes. If they work together how long will it take them to stuff the envelopes?

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory