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_30062172_3 (length VARCHAR, round VARCHAR, gt3_winner VARCHAR)

### Question ###
When  david ashburn richard westbrook is the gt3 winner and 1 is the round what is the length?

### Accurate SQL ###

SELECT length FROM table_30062172_3 WHERE round = 1 AND gt3_winner = "David Ashburn Richard Westbrook"