Three points a b and c exist in space such that b is between a and C it is known that a b equals 7 BC equals 4 and a C equals 9 or points a b and c Culinaire give a written explanation supported by mathematical evidence for your answer.

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