createCanvas(400, 400);

  noCanvas();

  noLoop();

  select("#mins").value();

  select("#sec").value();

  select("#music_sec").value();

  select("#mins").changed(valueChanged);

  select("#sec").changed(valueChanged);

  select("#music_sec").changed(valueChanged);

  valueChanged();

}

​

function valueChanged()

{

  var result;

  let mins = parseInt(select("#mins").value());

  let sec = parseInt(select("#sec").value());

  let music_sec = parseInt(select("#music_sec").value());

  result = ((60*mins)+sec)/music_sec;

  console.log(mins, sec, music_sec, result);

  select("#result").html(result);

}