Question 154117

Let x = amount of time it takes both working together to deliver all the papers

Candy delivers papers at the rate of 1/30 of the route per minute
Tim delivers papers at the rate of 1/90 of the route per min

Together, they deliver papers at the rate of 1/30 + 1/90=3/90 + 1/90=4/90 of the route per min.  So, our equation to solve is:

(4/90)*x=1 (one paper route, that is, all the papers) multiply each by 90

4x=90  divide each side by 4
x=22.5 minutes-------------amount of time it takes both to deliver all the papers working together

CK
 together they deliver at the rate of 1/22.5 of the route per min

4/90=1/22.5


Hope this helps---ptaylor