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_21784 ( "Level" real, "Shuttles" real, "Cumulative Shuttles" real, "Speed (km/h)" text, "Shuttle Time (seconds)" text, "Total level time (s)" text, "Distance (m)" real, "Cumulative Distance (m)" real, "Cumulative Time (min and seconds)" text )

### Question ###
What is the distance (in meters) when the shuttle time is 6.86 seconds?

### Accurate SQL ###

SELECT MIN("Distance (m)") FROM table_21784 WHERE "Shuttle Time (seconds)" = '6.86'