DW Runners

I'm using my ipad a lot, and often go days inbetween booting my laptop, but I want to start running more again, and keeping track of training run is an incentive (because spreadsheets are <3 ).

So I'm looking for an ipad spreadsheet app, which can calculate pace from time/distance, time from distance/pace, etc.

I've tested Documents Free and Free SpreadSheet, but neither seem to be able to handle different number formats (time/distance=pace), unless I'm not finding that function?

Does anyone know of an i-app that can handle this?