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).
Sixth grade is a year of education. In many nations, it is the first year of middle school or the last year of primary level. It is for students ages 11â12. This grade may be the last year of elementary school or the first year of middle school unless the student has been held back.