This works on a lot of quests like that, from the Red Snapper net-fishing quest outside the Draenei Starting Area(each alt can "fish" at the same pool if you fire all at once), to the "Extract Black Dragon Essence" quest in Dustwallow Marsh from Mudsprocket, to the Defias "Mining for shipwreck parts" underwater outside of the Theramore among many others; there's just as many that only work for one though even if timed together so it's pretty much a grab bag if you can find one that works, and if you do, be thankful it just saved you a bunch of time :P