I dont understand the question

Which rule describes the composition of transformations that maps △abc to △a”b”c

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3

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