If they work together, they should take less time to make a 50 pound bag.

This time is given by:

Using the given values, we get:

So, the total time is 18/5 = 3.6 hours.

It takes 3.6 hours to make a 50 pound bag.

You can now use proportions to find the time it takes for 1500 pound of corn to be gound.