the only one i'm absolutely sure of is the iv injection. it goes directly into the vein so it is utilitized within seconds. i suspect inhalation is second because the medication is absorbed directly into the capillaries of the lung, basically similar to going directly into the bloodstream. based on that criteria, you'd have to do a little investigation on the internet and in your textbooks. sorry, i can't be of more help.
#2 - inhalation
topical (including transdermal)
#1 - iv injection
im injection (generally take 15-30 minutes to take effect)
sub q injection