void Update(){
if(transform.position!=Vector3(50, 0, 0)) {
transform.position = Vector3(Mathf.Lerp(0, 50, 5*Time.TimeDelta), 0, 0);
}

public class go : MonoBehaviour {
    
    private Ray ray;
    private RaycastHit hit;
    private Vector3 rot = new Vector2(0, 0, 0);
    private int speed = 5;

    void Update ()
    {
  if (Input.GetMouseButton (0))
  {
   ray = Camera.main.ScreenPointToRay (Input.mousePosition);
   if (Physics.Raycast (ray, out hit))  //
   {
    rot.y = hit.point.y;
    rot.x = hit.point.x;
    rot.z = hit.point.z;
    if (transform.position != rot) //проверка дистанции
    {
     transform.position = Vector3.Lerp(transform.position, rot, Time.deltaTime * speed); //плавное движение
    }
   }
  }
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class servant : MonoBehaviour
{
    private Vector3 positionMove;
    private int speed = 20;

    private void Start()
    {
  positionMove = transform.position;
    }

    private void Update()
    {
  Vector2 MP = Camera.main.ScreenToWorldPoint(new Vector2(Input.mousePosition.x, Input.mousePosition.y));
  RaycastHit2D hit;
  if (Input.GetMouseButtonDown(0))
  {
   hit = Physics2D.Raycast(MP, Vector2.up);
   if (hit)
   {
    if (hit.transform.tag == "Finish")
    {
     positionMove = UnityEngine.Camera.main.ScreenToWorldPoint (Input.mousePosition);
     positionMove.z = 0;
    }
   }
  }
  float moveDelta = (positionMove - transform.position).magnitude;
  if (moveDelta <= speed * Time.deltaTime)
  {   transform.position = positionMove;
   return;
  }
  Vector3 moveDir = positionMove - transform.position;
  moveDir.Normalize();
  transform.position += moveDir * speed * Time.deltaTime;
    }
}