Table: uk_tunnels
Columns: county
tunnel
type
length_imperial
date_of_opening

Question: What Tunnel has an Imperial Length of 307 yd?
SQL: SELECT "tunnel" FROM uk_tunnels WHERE "length_imperial" = '307 yd'

Question: What Type of Tunnel is the Downhill Tunnel?
SQL: SELECT "type" FROM uk_tunnels WHERE "tunnel" = 'downhill'