I'm currently 90 ranged and I did 61-90 in like 2 weeks by afking NMZ with full void and rune xbow with broad bolts. costs next to nothing with the absorb method and its very afk (used to be like 1 hour 100% afk with 99def before patch, now its 20 mins at a time but you only need to click once to reset the 20 min timer)
its pretty good if your sitting at a computer anyways doing work, homework, class or whatever else. you tab in once every 20 min, re apply super ranging and absorbs and youre good to go
im getting 60k xp an hour at 90 ranged, but with blowpipe you can probably get 85 to 90k an hour but its more expensive