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Topic review (newest first)
Zach and MathsIsFun both already said that it was 6 hours.
What is the answer?
i cant be bothered working it out!
Let's look at how much they can do per hour (their "cleaning-up rate")
6 hours if it's dirty again in exactly the same way.
Paula can clan the room in 3 hours. Paula and Maria can clean it in 2 hours. How long would it take Maria working alone to clean the room.