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Two aluminum cans are stretched between a $54\text{ m}$ aluminum wire. At one end, a child holds the can up to her mouth and shouts a message. At the other end, a second child holds the can up to her ear with her little brother next to her, waiting his turn. Assume the speed of sound in air and aluminum is $343\text{ m/s}$ and $6420\text{ m/s}$, respectively.

Calculate the difference in time between the older sister hearing the message through the can and the little brother hearing the message through the air.

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