Q. Which scooter is suitable and comfortable for travelling 100 KM to 150 KM in a day. TVS Jupiter, Suzuki Access or Activa. Remember before answering I have never rode scooter always rode Bikes.

150km in 'a' day is assumed to be an once in a while event. If so, Jupiter will be the best. If this is a regular requirement, consider Aprilia 150125. With the bigger wheels, it may make the journey little bit easier. No scooter (sold in India at present) is built for that kind of daily mileage (150kms / day).

Scooters are not that much comfortable for long rides , go with some big 150 Aprilia as it can go to triple digit speed on highway

Jupiter has a very good mileage 60km/l and has a 5l tank. So, Jupiter is a good choice among the three.