does the bird keep turning around over and over? and so it flies 30.6km by the time the runner finishes.
Or does it just turn once. You know it flew 7.6/28 hours to get to the finish line. So now you want to know when the two met again? If it took t hours, then
7t = 7.6 - 4t
A runner is jogging in a straight line at a steady vr= 7 km/hr. When the runner is L= 7.6 km from the finish line, a bird begins flying straight from the runner to the finish line at vb= 28 km/hr (4 times as fast as the runner). When the bird reaches the finish line, it turns around and flies directly back to the rubber around and flies directly back to the runner.
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