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#2 2005-05-19 00:43:54
- Zach
- Super Member
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Re: Help Solve Rate Question
6 hours if it's dirty again in exactly the same way.
Something awefully strange is going on.
Last edited by Zach (2005-05-19 19:30:35)
Boy let me tell you what:
I bet you didn't know it, but I'm a fiddle player too.
And if you'd care to take a dare, I'll make a bet with you.
#3 2005-05-19 07:35:22
- MathsIsFun
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Re: Help Solve Rate Question
Let's look at how much they can do per hour (their "cleaning-up rate")
Paula is be able to clean 1/3rd of the room per hour. (1/3rd of a room times 3 hours = 1 room)
Paula and Maria together can clean 1/2 a room per hour.
So Maria's contribution is to speed things up from 1/3rd per hour to 1/2 per hour.
Let's calculate how much of an increase that is: 1/2 - 1/3 = 3/6 - 2/6 = (3-2)/6 = 1/6
So Maria is only really cleaning 1/6th of the room per hour.
So on her own it would be 6 hours.
(Maria is either very thorough at cleaning, or her heart isn't in it.)
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
#6 2005-07-30 02:18:52
- mathsyperson
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Re: Help Solve Rate Question
Zach and MathsIsFun both already said that it was 6 hours.
Why did the vector cross the road?
It wanted to be normal.