What is the speed of a car that travels 700 km in 3 hours and 30 minutes?

A) 150 km/h

B) 175 km/h

C) 185 km/h

D) 200 km/h

We know that 

     Speed = Distance/Time 

Distance = 700km

       Time = 3 h 30 mint = [3 + 30/60]hour= 3,5 hour 

     Speed = 700/3.5

                 =  200 km/h