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Fence painting
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?


Solution:
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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