A cylindrical soil sample is encased in an open-ended inclined tube with a diameter of 100 mm. There is a constant supply of water from the upper end of the sample and the outflow from the other end is collected in a beaker. The average amount of water collected is 1000 mm3 every 10 sec. The average outflow velocity is ________mm/sec. (π = 3.14) (Round off to three decimal places)