<PRE><B>Question 454223</B>
An installer can carpet a room in 3 hrs, an assistant needs 4.5 hours. If the assistant helps for one hour and then is called away, how long will it take the installer to finish

====
Installer rate = 1/3 job/hr
Assistant rate = 1/(9/2) = 2/9 job/hr
-----
Equations:
work  + work = job done
1(2/9) +  (1/3)x = 1
----
(1/3)x = 7/9
---
x = 7/3 = 2 1/3 hrs
=========================
Cheers,
Stan H.
===========</PRE>