Colorado ultrarunners Peter Bakwin and Buzz Burrell have linked Mount Rainier, Mount Adams and Mount Hood in 28 hours of climbing and driving. They had hoped to break 24 hours but encountered dangerous crevasse conditions on Rainier and opted for a more conservative effort.The two started at 2:42 a.m. on 14,411-foot Mount Rainier, climbing the 9,000-vertical-foot Ingraham Direct Route in a nine-and-a-half-hour round trip. Next up was a six-hour, 6,700-vertical-foot round trip on 12,276-foot Mount Adams, which they summited at dusk. They started up 11,239-foot Mount Hood in northern Oregon after midnight and summited after dawn. In all, they traveled about 35 miles on foot, with about 21,000 vertical feet of gain (plus approximately six hours of driving).Earlier this year, Bakwin and Burrell made a 10-hour ascent of Aconcagua, the highest peak in the Western Hemisphere, from the 14,300-foot basecamp to the 22,841-foot summit. (Bakwin had done the same climb in nine hours the year before.) Bakwin also holds the speed record for running the 220-mile John Muir Trail in California.