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_26986076_6 ( sat_21_aug VARCHAR, tues_24_aug VARCHAR )

### Question ###
What was the Sat 21 Aug time for the rider whose Tues 24 Aug time was 20' 38.40 109.680mph?

### Accurate SQL ###

SELECT sat_21_aug FROM table_26986076_6 WHERE tues_24_aug = "20' 38.40 109.680mph"