Advice needed: angled rip without a tablesaw

Hi,



The stock I'm working with is a strip of hardwood measuring 900x40x12.



I basically want to rip a single straight line so it remains 40mm on one end, but tapers off to 30mm at the other.



This is very different from ripping straight strips out of larger stock using a circular saw & straight edge and clamps, I have no idea how to approach it. Any advice would be appreciated.





Thanks,

Chris.