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

### Instruction:
What was the air date of the episode that has an 18-49 of 2.2/7?

### Inputs:
table_name: table, columns: ['Episode', 'Air Date', 'Timeslot', '18-49', 'Viewers']

### Response:
SELECT Air Date FROM table WHERE 18-49 = 2.2/7