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Students give 6 speeches. The lengths of the first four speeches are shown in the list below.
Speech 1 - 2 1/2 minutes
Speech 2 - 5 minutes
Speech 3 - 7 1/2 minutes
Speech 4 - 10 minutes
The length of each speech continues to increase by the same amount. What is the length of the 6th speech?-
minutes
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minutes
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minutes
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minutes
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