Let suppose, US is doing car race for three years and every years your total speed will give you a winner. 

First year you join and said, I used to speed in Nepal. OK..What was your speed. 45Km/hr ( Kilometer) 

First Year,

 Nepalese speed  ( Good driver)  45Km/hr....... US driver speed ( excellent road)     45Miles/hr

Second Year-------------60Miles--------'''''''''''''             ''''                        50Miles/hr

Third Year----------------65Miles............."""""""""""""""""''                               55Miles/hr... 

So you want to argue, 45Km/hr speed is equal to 45Miles/hr.

Actually, there is no problem.. thats how the  Education Standard System is established. 

Just look forward, and be proud they are going to be college in US.