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Part $1$

Wake County has a special emergency rescue team. The team is practicing rescuing dummies from a smokefilled building. The first$$ time, the team took $420$ seconds $(7$minutes$).$ The second$$ time, it took $378$ seconds $(6\mathrm{.}3$minutes$).$

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Part $2$

a$.$ The estimated learning rate is

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enter your response here$\%.($Enter your response as a whole$$ number.$)$