** how to calculate the speed of a car?**

Does anyone know how to calculate the speed of a car?

i have got a calculate math and tried to get speed of FG 1/5 F1 car and the result: @ 19.93537 MPH.

while FG F1 known can reach at 100KPH !!? what's wrong?

FG gear: clutch pulley 17T / main pulley 48T; layshaft pulley 18T / diff pulley 42T; engine @8000rpm?!

Thanks