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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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9 votes
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

asked
User Alexander Christov
by
8.4k points

1 Answer

12 votes

Answer:

30

Explanation:

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

answered
User Maxfridbe
by
8.0k points
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