Speed = 11 meters /s plane is 110 meters should take me 10 seconds but it dosn't

It all in the title my car is travelling at 11 meters /s and the road is 110 meters long well at lest its 110 along the x axis and I haven't changed anything in the settings but its taking a long time to get to the end I haven't got to the end cuse I stop at 20+ secconds the speed is calculated by rigidbody.velocity.magnitude * 3.6 to make it kph and the speed is around 40-43 kph. The car scale is 5,5,5 and the weight is 250 although I don't think that should matter.