A two-wheel drive tractor is taking a turn with a radius of curvature 5.0 m. The minimum horizontal distance between the tipping axis and line of action of the CG is 800 mm. The angle between the line of action of centrifugal force and perpendicular direction to the tipping plane is 15°. If the vertical distance of the CG from the ground level is 900 mm, the limiting speed (in km h⁻¹) of the tractor to prevent overturning (rounded off to two decimal places) is.