input: def most_efficient_order(tasks):
      """
      This method takes a list of tasks and produces the most efficient order for completing the tasks.
  
      Parameters
      ----------
      tasks: List
          A list of tasks to be performed.
  
      Returns
      -------
      List
          An ordered list of tasks representing the most efficient order for completing the tasks.
      
      Example:
      >>> tasks = [Task('Task1', 5), Task('Task2', 3), Task('Task3', 7)]
      >>> most_efficient_order(tasks)
      [Task('Task2', 3), Task('Task1', 5), Task('Task3', 7)]
      """
output:     tasks.sort(key=lambda task: task.duration)
      return tasks