A world-record swimmer and a dolphin compete in a 400-meter race. The swimmer swims at a rate of 2 meters per second, and the dolphin swims at a rate of 8 meters per second. When the dolphin crosses the finish line, how many meters is the swimmer from the finish line?
The dolphin swims four times faster than the swimmer, so it covers four times the distance in a given time. So when the dolphin has swum 400 meters to get to the finish line, the swimmer has swum $400/4=100$ meters, and is thus $400-100=\boxed{300}$ meters from the finish line.