I'm sure you mean 12pm, but anyway.
The starting time of lectures and tutorials differ depending on the unversity but generally there is always about 10 minutes in between, with them either starting late or finishing early. This is so people can get to back to back classes.
I urge you to be on time to tutorials - if you have a nice tutor they'll look it but if you are consistantly late then they may start deducting a percentage of your tutorial mark. As tutorials are small they do know who you are. It is also rude to disrupt it but consistently being late. Tutorials are generally optional, and if you walk in late you probably will disturb very few people. Try to be on time but if you have to be late be late to lectures.
If your classes are very far apart 10 minutes might not be sufficient to to get to your next one, if this is the case try to change them around, or if the second one is a tutorial talk to you tutor and explain you might regularly be slightly late.
I've had about 5 classes back to back before, its tiring but not uncommon.