Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Round', 'Circuit', 'Date', 'Length', 'Pole Position', 'GT3 Winner', 'GT4 Winner']

### Response:
SELECT Length FROM table WHERE Round = 1 AND GT3 Winner = David Ashburn Richard Westbrook