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_3005450_1 (km_from_wellington VARCHAR, metlink_code VARCHAR)

### Question ###
what is the km from wellington where the metlink code is mast?

### Accurate SQL ###

SELECT km_from_wellington FROM table_3005450_1 WHERE metlink_code = "MAST"