Megan is planting a garden with two beds with her mother and father. megan can plant 1 garden bed in 8 hours. her mother can plant 2 garden beds in that time, and her father can plant 1 1 3 garden beds in that time.
the three begin working together, but after 3 hours, megan's father leaves for work. her mother works half an hour longer and then leaves for work. how long will it take megan to finish planting the two garden beds by herself?