Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Park | Length (ft) | Height (ft) | Speed (mph) | Opened | Status |
| --- | --- | --- | --- | --- | --- | --- |
| Boardwalk Bullet | Kemah Boardwalk | 3236.0 | 96.0 | 51 | August 31, 2007 | Operating |
| Dauling Dragon | Happy Valley , Wuhan, Hubei, China | 3914.0 | 105.0 | unknown | 2012 | Operating |
| Hades 360 | Mt. Olympus | 4726.0 | 136.0 | 70 | May 14, 2005 | Operating |
| Ravine Flyer II | Waldameer | 2900.0 | 120.0 | 57 | May 17, 2008 | Operating |
| Twister | Gröna Lund | 1574.0 | 50.0 | 37.9 | 2011 | Operating |
| The Voyage | Holiday World | 6442.0 | 163.0 | 67 | May 6, 2006 | Operating |
| Wooden Coaster - Fireball | Happy Valley , Shenzhen | 3819.0 | 108.0 | 56 | July 28, 2009 | Operating |
| Wooden Warrior | Quassy Amusement Park | 1200.0 | 35.0 | 35 | 2011 | Operating |
| Zippin Pippin | Bay Beach Amusement Park | 2865.0 | 70.0 | 40 | 2011 | Operating |
Question:
What is the length of the coaster with the unknown speed
Answer:
3914.0