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A diver dives to 25 feet for 56 minutes, waits at the surface for 1 hours and 17 minutes, then dives 25 feet for 49 minutes,then waits on the surface for 1 hour.How long can the diver spend at 25 feet?

1) 73 minutes 2) 49 minutes 3) 81 minutes 4) 57 minutes
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