A Snail covered 3 mm in the first sec and 4 mm each in each successive sec for a certain no. of secs. However if it had covered 1 mm in the first sec. and 8 mm more in each successive sec for some secs , then the difference between the length of the path it would have covered during the same time and the actual path that it actually took would have been more than 6 mm and less than 30 mm. Find the time for which the snail moved.
Choose the correct option among the four.(The most appropriate one)