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Consider two cylindrical metal rods with equal cross section
-one lead, the other aluminum-connected in series. The temperature at the
lead end of the rods is 22.5 °C; the temperature at the aluminum end is 85.0 °C.
Given that the temperature at the lead-aluminum interface is 52.5 °C, and
that the lead rod is 14.5 cm long, what condition can you use to find the length
of the aluminum rod?

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