HELP! I don't understand this physics problem?
steady vr= 2.2 km/hr. When the runner is
L= 7.1 km from the finish line, a bird begins
flying straight from the runner to the finish
line at vb= 4.4 km/hr (2 times as fast as the
runner). When the bird reaches the finish
line, it turns around and flies directly back to the runner. What is the cumulative distance the bird travels?