If two balls are thrown simultaneously horizontally and from the same place, neglecting air resistance, both balls will hit the ground at the same time. The horizontal speed at which the balls are thrown does not affect the time it takes for them to reach the ground vertically.
When an object is thrown horizontally, its vertical motion is influenced only by the force of gravity. The force of gravity acts equally on both objects, causing them to accelerate downward at the same rate. This means that the time it takes for both balls to reach the ground vertically will be the same, regardless of their horizontal speeds.
However, it's important to note that if air resistance is not negligible, the situation may be different. Air resistance can affect the motion of objects and cause them to fall at different rates. But assuming we're neglecting air resistance, the balls will hit the ground at the same time.