Answer:
The value is 
Step-by-step explanation:
From the question we are told that
The distance from Jacksonville to Miami is d = 382 miles
The time it take to travel from Jacksonville to Daytona is 
The time it take to travel from Daytona Beach to Fort Pierce is 
The time it take to travel from Fort Pierce to West Palm Beach is

The time it take to travel from West Palm Beach to Miami 
Generally the average speed is mathematically represented as

=> 
=> 