Question 666084
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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 {{{1/6 + 1/8}}} = 7/24 of the room
 17/24 left:  {{{1/4 + 1/6 + 1/ 8}}} together do 13/24 of room per hour
 {{{(17/24)/(13/24)}}} = 1.3 hours Andy worked (rounded to the nearest tenth)