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How long did it take Siya to complete her fourth circuit?

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Siya is training for a charity race by running circuits, getting gradually slower. Her first three circuits took her 1 minute 11 seconds, 1 minute 15 seconds and 1 minute 29 seconds. If, after her fourth circuit, her average circuit time is 11 seconds longer than her fastest circuit, how long did it take Siya to complete her fourth circuit?

posted Mar 15, 2018 by Mridul

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