Write SQL query to solve given problem: What is the delivery time and the clerk of order number 6?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT JULIANDAY(T2.l_receiptdate) - JULIANDAY(T2.l_commitdate), T1.o_clerk FROM orders AS T1 INNER JOIN lineitem AS T2 ON T1.o_orderkey = T2.l_orderkey WHERE T1.o_orderkey = 6