Two dolphins are catching fish when they begin moving to the surface to get a breath of air. They start swimming toward the surface at the same time. The first dolphin is 120 feet below the surface of the ocean, and he swims upward at a rate of 4 feet/second. The second dolphin is 240 feet below the surface, and she swims upward at a rate of 12 feet/second. Which dolphin surfaces first and when?