Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_54908 ( "From" text, "Adult Rate" text, "Development Rate" text, "16-17 Year Olds Rate" text, "Apprentice Rate" text )

### Question ###
When was the rate for 16-17 year olds 3.40?

### Accurate SQL ###

SELECT "From" FROM table_54908 WHERE "16-17 Year Olds Rate" = '£3.40'