speed : NUMBER speed_unit

def p_speed_constructor(self, p):
        'speed : NUMBER speed_unit'
        logger.debug('speed = number %s, speed unit %s', p[1], p[2])
        information_unit, duration = p[2]
        information = Information.from_quantity_unit(p[1], information_unit)
        p[0] = information.in_duration(duration)