For three consecutive days, a runner trained for 3 hours and 20 minutes each day. On each day, their speed was such that they completed one mile in an integer number of minutes. Their speed decreased each day, resulting in the time taken to run one mile increasing by 15 minutes compared to the previous day. If the distance run each day was an integer number of miles, what was the total distance the runner covered over the three days?
28
30
33
36
40
