def predict_gear_box_speeds_in(cvt, velocities, accelerations,
    gear_box_powers_out):
    """
    Predicts gear box speed vector, gear vector, and maximum gear [RPM, -, -].

    :param cvt:
        Continuously variable transmission model.
    :type cvt: callable

    :param velocities:
        Vehicle velocity [km/h].
    :type velocities: numpy.array

    :param accelerations:
        Vehicle acceleration [m/s2].
    :type accelerations: numpy.array

    :param gear_box_powers_out:
        Gear box power vector [kW].
    :type gear_box_powers_out: numpy.array

    :return:
        Gear box speed vector, gear vector, and maximum gear [RPM, -, -].
    :rtype: numpy.array, numpy.array, int
    """
    return cvt.predict(velocities, accelerations, gear_box_powers_out)
