¿Alcohol o gasolina?
<script type="text/javascript">
var tanque = 40;
var recorridoGasolina = 480;
var consumoGasolina = recorridoGasolina/tanque;
var recorridoAlcohol = 300;
var consumoAlcohol = recorridoAlcohol/tanque;
document.write("El consumo de gasolina es " + consumoGasolina + " km/Litro");
document.write("<br>");
document.write("Él consumo de alcohol es " + consumoAlcohol + " km/Litro");
</script>