We know that the distance is 90 feet from home to first base. Is this to the front, middle or back of the bag?
The distance from home to first and third bases is 90' measured from the center of the home plate to the center of the bag
It's 90 feet from the back point of home plate to the outside edge of the first base bag.
See the official rules here:
Look in the Objectives section at the diagrams of the bases.
the distance between home and first base is 90 feet (27.432 meters). Some players with a long follow through will take longer to start sprinting, thereby having a slower score which underestimates their true running speed.
It is 90 feet away from the back of the bag. You should have a good follow through for a high score on this excellent site called nexpay.