def convert_int_minutes_to_militar_time_format(list):
    """
    Convert the list of minutes ranges to a list of hour ranges.

    >>> convert_int_minutes_to_militar_time_format([[540, 600], [720, 780]])
    [['9:00', '10:00'], ['12:00', '13:00']]
    """
    result = []
    for i in list:
        hours = int(i[0] / 60)
        minutes = int(i[0] % 60)
        hours2 = int(i[1] / 60)
        minutes2 = int(i[1] % 60)
        if minutes == 0:
            minutes = '00'
        elif minutes < 10:
            minutes = '0' + str(minutes)
        if minutes2 == 0:
            minutes2 = '00'
        elif (minutes2 < 10):
            minutes2 = '0' + str(minutes2)

        result.append([str(hours) + ':' + str(minutes),
                      str(hours2) + ':' + str(minutes2)])
    return result