Respuesta :

Answer:

See below

Step-by-step explanation:

212 mile/hr  to 1 SD = 200 mile/hr

4000 sec/ hr    /    200 mile/ hr  = 20 sec / mile

OVER or UNDER ?

  actual :

       3600 / 212 = 16.98 sec / mile  

            so   20 sec / mile  is an     OVER ESTIMATE