def calculate_gear_box_speeds_in_v1(gear, final_drive_speed,
    gear_box_ratios, clutch):
    """
    Calculates Gear box speed vector [RPM].

    :param gears:
        Gear vector [-].
    :type gears: numpy.array

    :param gear_box_speeds_out:
        Wheel speed vector [RPM].
    :type gear_box_speeds_out: numpy.array

    :param gear_box_ratios:
        Gear box ratios [-].
    :type gear_box_ratios: dict

    :return:
        Gear box speed vector [RPM].
    :rtype: numpy.array
    """
    if clutch == 1:
        return 0
    return final_drive_speed * gear_box_ratios[gear - 1]
