Respuesta :
Answer:
William's fastest speed is 7.5 km/h
Step-by-step explanation:
Let the fastest speed of William is f therefore from the question's statement the equation will be
f - 6 = 1.5
Here difference between William's fastest speed and typical speed is 1.5 km/h
Now we will add 6 on both sides of the equation
(f - 6) + 6 = 1.5 + 6
f = 7.5 km/h
So the fastest speed is 7.5 km/h