What is the land speed record?

Depends what you mean:

Road Car: 275mph (Koeniggsegg Agera R)

Road Motorcycle: 300mph (Dodge Tomahawk)

The current absolute record holder is ThrustSSC, a twin turbofan-powered car which achieved 763 miles per hour (1,228 km/h) for the mile (1.6 km), breaking the sound barrier.