In the story "School's Out—Forever" by James Patterson, Fang is asked if he knows how fast he was traveling. He honestly responds that he does not know, and it is revealed that he was going seventy miles per hour. This indicates they are moving at a surprisingly high speed.
One of the characters comments on the speed, expressing surprise and admiration, which adds to the tension or significance of their journey. Fang receives a look from someone else, and the narrator tries to stay quiet, emphasizing the importance or stealth involved in their situation.