Question
Ethan's timing for running in his first three heats were 45 s, 45 s, and 51 s. He wishes to improve his overall average timing by 2 s. What timing must he clock in the fourth heat?
2 m

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Ethan's timing for running in his first three heats were 45 s, 45 s, and 51 s. He wishes to improve his overall average timing by 2 s. What timing must he clock in the fourth heat?