Question
Sean's timing for running in his first four heats were 52 s, 40 s, 53 s, and 59 s. He wishes to improve his overall average timing by 3 s. What timing must he clock in the fifth heat?
2 m

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Sean's timing for running in his first four heats were 52 s, 40 s, 53 s, and 59 s. He wishes to improve his overall average timing by 3 s. What timing must he clock in the fifth heat?