Answer:
San Francisco is the fastest
Explanation:
The reason why is because you have to get the hours the same soooo...
You can get all of the hours to 12. So Ph= 3hours so 3x4=12 and what you do on one side you have to do on the other. So 1689x4=6756 next M=2 hours so to get it to 12 you do 2x6=12. Then 913x6=5478. Next San=4 hours
4x3=12 next 3x2556=7668 Sooooooo.... Put the data together
In 12 hours Ph goes 6756 miles
In 12 hours M goes 5478 miles
In 12 hours San goes 7668 miles
So the answer is San because it has the biggest number
Hope this help have a good day :)