### Instruction: Pirate Rick sailed his ship to a tropical island in search of a site to bury his treasure.  After finding the perfect site, it took him 4 hours to dig up 8 feet of sand under which to bury the treasure.  Once the treasure was buried, he left the island.  Then, a tropical storm came and washed away half of the sand from on top of the treasure.  Next, a giant tsunami wave poured over the island, adding 2 feet of new sand back onto the site of his treasure. When Pirate Rick returned, how long did it take for him to dig up his treasure?### Response: Pirate Rick digs at a rate of 8 feet of sand per 4 hours, or 8/4=2 feet per hour.
Since the storm washed 8/2=4 feet of sand from atop the treasure, this means the treasure was buried beneath 8-4=4 feet of sand.
Since the tsunami added 2 feet of sand to the site, this means there were 4+2=6 feet of sand atop the treasure when Pirate Rick returned.
Thus, Pirate Rick was able to dig up his treasure in 6/2=3 hours.
The answer is 3