Quoted from KozMckPinball:2 trains are travelling towards each other on the same First Continental Railroad track. The train leaving Sioux City, Iowa is going 45 mph and the train leaving Portland, Oregon is going 48 mph, neither train has working brakes. A bald eagle is flying back-and-forth between the trains at 35 mph. How far does the eagle fly before the trains collide?
To fly back and forth between the trains, the eagle would need to fly faster than the trains.