The vet says that lena’s puppy will grow to be at most 20 inches tall. lenas puppy is currently 1 foot tall. how many more inches will the puppy grow

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours