Instantiate for few seconds

I want to create objects for few seconds after colliding it. Could you tell me how to destroy clones after few seconds after colliding and creating them? I’m using C# scripts.
Ps. I’m thinking about something like destroying clones 5 seconds after creating them. (sorry if i made mistakes i’m not from USA or England and I don’t know English Well… )

using UnityEngine;
using System.Collections;
public class Object_1 : MonoBehaviour {

    public Transform prefab; 
     void OnTriggerEnter(Collider anotherobject)
    {
       Instantiate(prefab, new Vector3(208.353F, -81.55669F, 179.8901F),new Quaternion(90, 0 ,0, 90));

              Instantiate(prefab, new Vector3(208.353F, -81.55669F, 175.8901F),new Quaternion(90, 0 ,0, 90));

             Instantiate(prefab, new Vector3(208.353F, -81.55669F, 173.8901F),new Quaternion(90, 0 ,0, 90));
    }
            }

You can do that by using Destroy with a time:

   var newOne = Instantiate(prefab, new Vector3(208.353F, -81.55669F, 179.8901F),new Quaternion(90, 0 ,0, 90)) as Transform;
   Destroy(newOne.gameObject, 5);

Or if you prefer:

   Destroy((Instantiate(prefab, new Vector3(208.353F, -81.55669F, 179.8901F),new Quaternion(90, 0 ,0, 90)) as Transform).gameObject, 5);