Gratis Rijbewijs Online Forum

hello
i noticed some difference between the theory book and theory notes from the computer (online programme - http://www.drivinglicence-belgium.be" target="_blank)
for example, the book says the maximum speed for B class moped is 45 km/h
and the computer programme says 40 km/ hr.
Like this, many other differences. Whichone should i follow?
Regards
Babu

and the computer programme says 40 km/ hr.

Where is that written on the site?