getting data from many-to-many relationship laravel

I have this relationship:

Product:

public function cities()
{
   return $this->belongsToMany('App\Cities', 'product_price_in_city', 'products_id', 'city_id')->withPivot('product_price_city');
}

Cities:

public function products()
{
   return $this->belongsToMany('App\Product', 'product_price_in_city', 'city_id', 'products_id')->withPivot('product_price_city');
}

Now if I need to get a price for a particular product in that city, how can I do that in Product or Cities Model?

Something like this:

I did this in Product model. I know this is wrong, but how should I do something like this?

public function getProductRateForCity($city_id)
{
    return $this->cities()->where('city_id', $city_id)->where('product_id', $this->id);
}

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