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).
In areas that adopted a three-tier system, the term primary school is often used as an alternative to First School, taking in ages up to 9 or 10 years old, although for education planning purposes, the term primary education in these areas will still cover the age groups as in a two-tier system.