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Andy paints 1 egg in 8hr means 2 eggs in 16hrs.
Bob paints 2 eggs in 8 hr.
Cindy paints 4/3 egg in 8hr means 2 eggs in 12hr.
3/12 + 7/2/8 + T/16 =1
T/16 = 5/16
T=5hr
So andy works for 5 hrs in total.
no. of hrs he worked after cindy & bob left=5-3.5=1.5hr(ANS)
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