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Grazes
Beth had planned to run an average of 6 miles per hour in a race. She had a very good race and actually ran at an average speed of 7 miles per hour, finishing 10 minutes sooner that she would have if she had averaged 6 mph. How long was the race?
if t is her normal time for 6 mph speed, 6t = 7(t-10) you can solve for t...