SOLUTION: It takes 2 hours for 3 cooks to prepare the food for a wedding rehearsal dinner. How long will it take 5 cooks to prepare the dinner?
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If it takes 3 cooks 2 hours, then each cook can prepare of the meal in 2 hours, therefore each cook can prepare of the meal in one hour. So 5 cooks can prepare of the meal in one hour, hence 5 cooks can prepare one meal in hours.