Re: Help - simple algebra

On Thu, 20 Mar 2008 22:58:54 GMT, Martin
<martin.wilkins50@[EMAIL PROTECTED]
> wrote:

>How do you solve this problem

A  RELATED REATES PROBEM.

       Amount  painted per hour:
       S = sally = 1/4
      J = John = 1/6
Together  T = 1/4 + 1/6 = 5/12
 So they do together 5/12 of the job per hour. 
So they do the job in 12/5 hours = 2 hours and 24 minutes.
>
>If Sally can paint a house in 4 hours, and John can paint the same house 
>in 6 hour, how long will it take for both of them to paint the house 
>together?
>
>	2 hours and 24 minutes
>	3 hours and 12 minutes
>	3 hours and 44 minutes
>	4 hours and 10 minutes
>	4 hours and 33 minutes
>
>Apparently it's 2 hours and 24 minutes
>
>Thanks
>
>Martin