rest period for relief drivers

Can anyone help with the following question;

Daily rest period for single driver is 11 hours. This can be reduced to 9 hours 3 times a week. What is the daily rest period allowed for relief drivers in a truck being double manned?

Thanks

It is in here

viewtopic.php?f=7&t=71511

Your question has been answered here.

viewtopic.php?f=7&t=80905