<PRE><B>Question 508431</B>
A new truck has arrived at Kroger. It takes Jimbo six hours to unload such a truck, while it takes Olaf
ten hours to unload it. If Jimbo and Olaf work together, how long will it take them to unload the truck?
------------------
Jimbo rate = 1/6 job/hr
Olaf rate = 1/10 job/hr
---
Together rate: 1/x job/hr
----
Equation:
1/6 + 1/10 = 1/x
Multiply thru by 30 to get:
5x + 3x = 30
8x = 30
x = 15/4 = 3 hr 45min (time to do the job alone)
==================================================
Cheers,
Stan H.
=================</PRE>