Q1：

$(document).ready(function() {
    var hours = Math.floor( $('.totalMin').html() / 60);          
    var minutes = $('.totalMin').html() % 60;


    $('.convertedHour').html(hours);
    $('.convertedMin').html(minutes);    

});

Q2：

$(document).ready(function() {

    var minutes = 0;

    $('.min').each(function() {
        minutes = parseInt($(this).html()) + minutes;
    });

    var realmin = minutes % 60
    var hours = Math.floor(minutes / 60)

    $('.hour').each(function() {
        hours = parseInt($(this).html()) + hours;
    });


    $('.totalHour').html(hours);
    $('.totalMin').html(realmin);    

});