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It takes 20 minutes for Janis to prepare lunch. When Kristen helps, it only takes 12 minutes. How many minutes would it take Kristen to prepare the same lunch if she worked alon…

It takes 20 minutes for Janis to prepare lunch. When Kristen helps, it only takes 12 minutes. How many minutes would it take Kristen to prepare the same lunch if she worked alon…
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It takes 20 minutes for Janis to prepare lunch. When Kristen helps, it only takes 12 minutes. How many minutes would it take Kristen to prepare the same lunch if she worked alone

User Alexander Christov
by
8.4k points

1 Answer

12 votes

Answer:

30

Explanation:

(Solution: 12/20 + 12/x = 1, x = 30 min)

User Maxfridbe
by
8.0k points
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