According to Official Guinness Records,
The fastest 10 km by quadricycle is 44 min 21.91 sec and was achieved by Corinne Hutton, David Hutton, Colin Hutton and Andy McLaren (all UK), in Millport, Isle of Cumbrae, UK, on 31 May 2015. This record-breaking ride around the Isle of Cumbrae was undertaken in support of Finding Your Feet, a charity that supports those who have been affected by a life changing physical trauma. Finding Your Feet was set up by Corinne Hutton, one of the riders, who at the age of 42 suffered a life threatening illness that required the amputation of both her hands and both legs below the knee. Corinne's mission is to show that limb loss is no barrier to living a full life.
For a complete list of 2015 records, please visit 2015 Guinness Records in United Kingdom.