code: 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(durationf 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)
docs: speed : NUMBER speed_unit