Posted by **Britanny** on Friday, December 5, 2008 at 5:17pm.

If sally can paint a house in 4 hours and John can paint the same house in 6 hours. How long will it take for them to paint the house together?

- Math -
**Leo**, Friday, December 5, 2008 at 5:27pm
HINT

Sally can paint 3 houses in 12 hours.

John can paint 2 houses in 12 hours.

Therefore, Sally and John together can paint 5 houses in 12 hours.

So, at the same rate, how long will it take them to paint 1 house together?

- Math -
**Ms. Sue**, Friday, December 5, 2008 at 6:05pm
Use Leo's hint that together they could paint 5 houses in 12 hours.

Divide: 12 by 5 = 2.4

That means that Sally and John together can paint a house in 2.4 hours.

- Math -
**Reiny**, Friday, December 5, 2008 at 6:17pm
or..

Sally's rate = house/4 hrs

John's rate = house/6 hours

combined rate = house/4 + house/6 = 5house/12

so time with combined rate = house/(5house/12) = 12/5 = 2.4 hours

- dmioa opzkaerfx -
**dmioa opzkaerfx**, Friday, February 6, 2009 at 12:26pm
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