Answer :

AL2006

The car's rate of speed is precisely  1,212 km per 4 hours.

If you're more comfortable with a unit rate, then simply
perform the division:

   1,212 / 4 = 303

1,212 / 4  km/hr  =  303 km/hr


pikachu2517
The car's rate of speed is 303 kilometers per hour. 
1,212 kilometers/4 hours / 4/4 = 303 kilometers/1 hour