Is it permissible for a resident in the Netherlands, who works as a teacher and travels a distance of 35 km between educational institutions at noon during winter time, to combine the Dhuhr and Asr prayers?

The journey that permits combining prayers is the journey of qasr (shortening prayers), and the mentioned distance (45 km) is less than the distance of qasr (approximately 83 km one way). Therefore, each prayer must be performed at its due time, unless one experiences extreme hardship and this work is necessary for their livelihood. In such a case, combining prayers is permissible, but it should not become a habit.