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).
Education at this level lasts for 5 years and is compulsory for all children.The country's literacy rate is over 90%. According to the Multiple Indicators Cluster Survey 2006 of Vietnamâs General Statistics Office, 96% of six to 11-year-old children enrolled in primary school.hildren in the Netherlands must be at least four years old to enter primary education. Almost all 4-year-olds (99.3%) in the Netherlands indeed attend primary school, although this is not compulsory until children reach the age of 5. Primary school is free of charge.