In such a situation the most important indicator for bleeding would be repeated swallowing. This is because the bleeding may be occurring and sliding down the back of the individual's throat which may feel like excess saliva, which in term would cause the individual to swallow repeatedly. In this process, the blood may completely pass the nasal drip pad without ever touching it, thus why it is remaining dry and intact.
The answer is 1 meter because the 10 meters will be too long for a desk to be used by one person which is a teacher in this case. For a single person, one meter is a better estimate than 10.
A 10 meter wide table cen be used for a conference table where a lot of people can share the space .
