Q 114

Lets say my base land speed is 40

If my character has the weapon called Rapid Wrath from Ghostwalk which says:
"This +1 mighty cleaving shortspear doubles
the speed of a creature that carries it"

and my character also have the fiendish graft called Feathered Wings from Fiend Folio which says:
"The grafted creature can fly at a
speed equal to twice its normal land speed, with average
maneuverability"

My Land speed would be 80
Does that mean my fly speed is 160 or is that also doubled which means 320 fly speed?