code: def p_duration_information_speed(self, p):
          'duration : information AT speed'
          logger.debug('duration = information %s at speed %s', p[1], p[3])
          p[0] = p[1].at_speed(p[3]f p_duration_information_speed(self, p):
          'duration : information AT speed'
          logger.debug('duration = information %s at speed %s', p[1], p[3])
          p[0] = p[1].at_speed(p[3])
docs: duration : information AT speed