7. RACE Kate enters a 120-mile bicycle race. Her usual rate is 10 miles per hour, but Kate plans to average \( x \) miles per hour faster than that. Write and graph an equation to represent the time it would take Kate to complete the race as a function of \( x \) (Kate's speed beyond 10 miles per hour). If she intends to finish the race in 5 hours instead of 12 hours at her usual rate, how much faster should she travel?
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