SOLUTION: there are 3 kids in a family . anna ,peter and maria .anna can clean the house fpor 1 hour ,peter can do the same job for 3 hours and maria nees 6 hours .how much time do they nee
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Question 1162637: there are 3 kids in a family . anna ,peter and maria .anna can clean the house fpor 1 hour ,peter can do the same job for 3 hours and maria nees 6 hours .how much time do they need to work to finish the same cleaning if they do it altogether?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Their combined speed is .
Reciprocal of that is HOURS for ONE JOB; or in this example, 40 minutes.
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