1 yard = 3 feet.
Therefore, 1620 yards = 4860 feet
4860 ft in 9 minutes, or 540 seconds
Average speed = distance / time
Average speed = 4860 ft / 540 seconds
Average speed = 9 ft / s
Time = distance / speed
Time = 351 ft / (9ft/s)
Time = 39 seconds!!
