<h3>¿Alcohol o gasolina?</h3>
<script >
var tanke = 40
var km = 480
var promedio =(km/tanke);
document.write("km x litros gasolina <br> " + promedio);
document.write("<br> ");
var tanke = 40
var km = 300
var promedio =(km/tanke);
document.write("km x litros alcohol <br>" + promedio) ;
</script>