Enzo needs to construct two electrical poles 30 m apart. The first pole is 28 m tall, while the second is 12 m tall. In order to support the weight of the poles, a stake is to be planted at ground level. Then, a tension wire will be attached from each of the poles onto the stake. If Enzo wants to minimize the amount of tension wire used, how far from the 12 m tall post should he plant the stake?