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).
This change typically saw reassignment of grade 9 to the (senior) high school, with grade 6 sometimes included in middle school with grades 7 and 8. Subsequent decades in many states have also seen the realignment of teacher certification, with grade 6 frequently now included on the secondary teaching certificate.