Hello! So, when we find the unit rate by doing 18/9, Marcus delivers 1 paper every 2 minutes. To find out how long it take him to deliver 72 papers and 100 papers, multiply by the unit rate, which is 2. 72 * 2 is 144. It would take 144 minutes (2 hours 24 minutes) to deliver 72 papers. 100 * 2 is 200. It would take 200 minutes (3 hours 20 minutes) to deliver 100 papers. You find this by finding the unit rate, which is 1 paper delivered every 2 minutes. Then, we multiply the number of minutes by the number of papers dropped off. In case you need to read the answers better, here they are.
Amount of time to deliver:
72 papers: 144 minutes (2 hours 24 minutes)
100 papers: 200 minutes (3 hours 29 minutes)
