Answer: It will take 1.75 minutes to travel from Paris to Nice.
Explanation:
Since we have given that
Distance between the two cities = 921,000 meters
Since we know that
1 km = 1000 meters

Speed at which the train travels = 307 km/hr
As we know the formula for time taken:

Hence, it will take 1.75 minutes to travel from Paris to Nice.