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).
Some secondary schools include students in grades seven and eight, along with the higher grade levels. Secondary schools represent the final stage of compulsory schooling in most U.S. states. State law proscribes school attendance until graduation or until a specific age, whichever comes earlier.