as @ynike99 put it, its probably the fuel/coolant overflow pipe. I checked the parts manual, it did show a Y connector.
I did not know until now that the rc had a Y connector joining the fuel and coolant overflow (the duke's have independent outlets for the fuel and coolant overflow, with the coolant overflow being hidden under fuel tank cover). Would appreciate if someone posted a pic showing the pic from their bikes (or i'd have to wait and check at my svc the next time i visit)
On a general note, these are the probable sources of the hoses that dangle under a bike:
1. Carburetor overflow/drain pipe (not present on ktm)
2. Battery breather hose (battery is sealed maintenance free with no breather hose)
3. Fuel tank vent hose (present on the ktm's)
4. Coolant overflow (present on the ktm's)
5. Crankcase breather pipe (present on the ktm's but is closed on the end with a small transparent plastic cap and you can see if on the lhs above the side stand area) This usually collects a bit of oil (due to the crankcase pressure/venting) over time and you can remove it and clean it out and put it back on.





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