Question
Xavier's timing for swimming in his first three heats were 48 s, 58 s, and 47 s. He wishes to improve his overall average timing by 1 s. What timing must he clock in the fourth heat?
2 m

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Xavier's timing for swimming in his first three heats were 48 s, 58 s, and 47 s. He wishes to improve his overall average timing by 1 s. What timing must he clock in the fourth heat?