HumorShack - Riddle #4 [Previous Riddle] [Next Riddle] Solution to Fence Painting riddle Two hours. Alicia can complete 1/3 of the job in one hour and Mark can complete 1/6 of the job in one hour; therefore, together they can complete 1/3 plus 1/6 or 1/2 of the job in one hour. Consequently, the entire job can be completed in just two hours. Or, you can figure it by saying (a x b)/(a+b)=time spent. [Previous Riddle] [Next Riddle]

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