/**
 * @param {Number} hours
 * @param {Number} minutes
 * @param {Number} interval
 * @returns {String}
 */
module.exports = function (hours, minutes, interval) {

    var newhour = Math.floor((hours * 60 + minutes + interval) / 60);
    var newmin = Math.round((((hours * 60 + minutes + interval) / 60) - newhour) * 60);

    if (hours >= 0 && hours <= 23 && minutes >= 0 && minutes <= 59 && interval >=0 && Number.isInteger(hours) && Number.isInteger(minutes) && Number.isInteger(interval)){
        if (newmin < 10) {
            if(newhour === 24){
                return "00:0" + newmin
            } else{
                return newhour + ":0" + newmin
            }
        } else{
            if(newhour === 24){
                return "00:" + newmin
            } else{
                return newhour + ":" + newmin
            }
        }
    }
};