Flipping with parters - how much profit should I take?

Hi all,

I have a couple people that are interested in doing a flip with me so I can get some funds and partner with them on long term deals. They will be bringing all the money and I will be managing the flip (they are experienced long term investors and I'm a property manager with a lot of big turnover experience). After I pay them back their original investment, how should the profits be split? 40/30/30? 60/20/20? Is there a rule of thumb for this or a standard?

Thanks!