I'm trying to set up a spreadsheet that tracks total hours worked and total
units produced. Then I need to have a column that shows how many units per
hour were produced.

Currently, I have something like this:
Column A is in elapsed time [h]:mm
Column B is a Number with two decimal places
Column C divides Column B by Column A

However, I get strange results. For example:
Column A is 6:24:00
Column B is 13
Column C shows 120.00

13 parts in 6:24 hours should be something like 2.1666 parts per hour!
Please help!