Ty and marshon are brothers. their grandmother wants her leaves raked and the yard mowed. when ty does the work on his own he can complete the work in 6 hours. it takes marshon 10 hours to complete the work on his own. today, their grandmother wants her grandsons to work together to complete the work. how many hours will it take ty and marshon to rake the leaves and mow the lawn when they work together? (do not round your answer.)