First, convert the speed of the Mustang to mi/hr (mph) using 1 mi = 5280 ft and 1 hr = 3600 s.

     
     = 19.77 mph

Next, use 0.3048 m = 1 ft and 1 km = 1000 m to convert to km/hr:

     
     = 31.82 km/hr

Similarly, calculate the speed of the Pinto in mph and km/hr:

     
     = 22.37 mph

     
     = 36.00 km/hr

When the speeds of both car models are converted to common units, the Pinto is faster.

Final Results