Question
John's timing for running in his first four heats were 51 s, 48 s, 56 s, and 45 s. He wishes to improve his overall average timing by 1 s. What timing must he clock in the fifth heat?
2 m

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John's timing for running in his first four heats were 51 s, 48 s, 56 s, and 45 s. He wishes to improve his overall average timing by 1 s. What timing must he clock in the fifth heat?