An airplane can travel at a speed of 400kmph to 9000kmph.
Brazil has recently gone through changes in school grades. Currently, at the age of 6 children attend from the grade 1 to 4 what is called Ensino PrimÃ¡rio (Portuguese for Primary Teaching, or Primary School), and afterwards from grade 5 to 9 the Ensino Fundamental (Fundamental Teaching/School).
Definition of primary for Students. 1  1 : first in time or development the primary grades. 2  2 : most important : main primary duties. 3  3 : not made or coming from something else : basic the primary source of information.  4 : relating to or being the heaviest of three levels of stress in pronunciation.