def epoch_time(start_time, end_time):
    """
    Computes the time for each epoch in minutes and seconds.
    :param start_time: start of the epoch
    :param end_time: end of the epoch
    :return: time in minutes and seconds
    """
    elapsed_time = end_time - start_time
    elapsed_mins = int(elapsed_time / 60)
    elapsed_secs = int(elapsed_time - (elapsed_mins * 60))

    return elapsed_mins, elapsed_secs