SOLUTION: Jack usually mows his lawn in 5 hours. Marilyn mows the same size lawn in 3 hours. How long would it take to mow the lawn together?
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Question 616767: Jack usually mows his lawn in 5 hours. Marilyn mows the same size lawn in 3 hours. How long would it take to mow the lawn together?
Answer by dragonwalker(73) (Show Source): You can put this solution on YOUR website!
Find the mean time that it takes to mow the lawn:
(5 + 3)/2 = 4 hours
But as there are two people doing it at this mean speed then the actual time would be half this so it would actually take 4/2 = 2 hours
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