Write a system of equations to describe the situation below, solve using any method, and fill in the blanks. A couple of friends decide to race each other. Harold can run 4 yards per second, whereas Karen can run 7 yards per second. Because he is slower, Harold also gets a head start of 9 yards. Shortly after they start running, Karen will catch up to Harold. How far will Karen have to run? How long will that take?

Karen will catch up to Harold after running __ yards in __seconds.
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