<meta charset="UTF-8">
<h3>¿Alcohol o gasolina?</h3>
<script>
var tanque = 40
var gasolina = 480
var alcohol = 300
document.write("Usando gasolina el total es de: " + (gasolina/tanque) + " Km/h." + "<br>");
document.write("Usando alcohol el total es de: " + (alcohol/tanque) + " Km/h." + "<br>");
</script>