Mastering Physics Solved! You and your friends find a rope that hangs down 16m from a high tree

You and your friends find a rope that hangs down 16m from a high tree branch right at the edge of a river. You find that you can run, grab the rope, swing out over the river, and drop into the water. You run at 2.0 m/s and grab the rope, launching yourself out over the river. How long must you hang on if you want to drop into the water at the greatest possible distance from the edge?