William's fastest speed given his typical speed and the diffeerence between his fastest speed and his typical speed is 7.5 mi/h.
What is William's fastest speed?
Addition is determining the total value or summing two or more numbers. Addition is one of the four basic operations in mathematics.
Fastest speed = 1.5 + 6 = 7.5
To learn more about addition, please check: https://brainly.com/question/19628082
