from datetime import datetime


def get_prize_for(start, end, pph=0):
    """
    calculate prize of billard table rental

    :param start: start datetime of rental
    :param end: end datetime of rental
    :param pph: prize per hour of rental
    :return: the calculated prize of rental
    """
    pps = pph / 3600
    time = (end - start).seconds
    prize = round((pps * time), 1)
    return prize