If you commit to this type of challenge at this speed, you are an experienced runner. To run 14km/h in this type of race means that you have already participated in other distance competitions or have experience running long distances
In any case, it is always important to check your equipment; good footwear, appropriate clothing, and specialised running water bottle. Look after your body, (especially feet, tendons, muscles, and back) by stretching well after each workout. Try to see a physiotherapist after the race to help muscle recovery.
Be sure to follow the coach's advice given at workouts.
Ideally, place your sessions Monday, Wednesday, thursday, and Saturday, Sunday.
You must prepare yourself mentally for this challenge. Even during the toughest workouts, do not be discouraged - think positively and keep focused on your race date.
Listen to your body when it needs to recover; learn your bodies signals and adapt your workout if necessary.
Good preparation and good luck.