Hi,

Re TY.  Thank You for calling attention to the typo. 

Andy can paint a room in 4 hours, Betty in 6 hours and Chuck in 8 hours. 

Betty and Chuck work together for 1 hour  0r did  = 7/24 of the room

 17/24 left:   together do 13/24 of room per hour

  = 1.3 hours Andy worked (rounded to the nearest tenth) 

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