Chad and Jacob are diving the Regina shipwreck off of Port Sanilac in Lake Huron. They are diving to 70 feet, staying for 30 minutes, and doing a 3 minute saftey stop at 15 feet. After the dive, they'll re-board Double Action Dive Charters' boat the GoBetween and travel for a hour and thirty minutes to dive the Sport shipwreck which is at a depth of 50 feet.
How long can they stay at depth to view the shipwreck?
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Answer: 51 minutes