An engine, running at 1200 rpm, drives a 1.2 m diameter rigid wheel on a non-deformable surface at 5 km.h^-1 forward speed. The power is transmitted from engine to the wheel through a transmission gear box (gear ratio =3:1), a differential (gear ratio =4:1), and a final drive (gear ratio =n:1). Neglecting the deformation of the wheel and wheel slip, the value of n is ______ (Rounded off to 2 decimal places)