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Riddle
If it
takes Alicia 3 hours to paint a fence, and it takes Mark 6 hours to
complete the same job. How long would it take both of them working
together at their normal paces to complete the same job?
Answer
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.
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