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There is a narrow bridge, and it can only hold two people at a time. They have one torch and, because it's night, the torch has to be used when crossing the bridge. Person A can cross the bridge in 1 minute, B in 2 minutes, C in 5 minutes, and D in 8 minutes. When two people cross the bridge together, they must move at the slower person's pace.
By way of specifying the logical task unambiguously, solutions involving either reaching an island or mainland bank other than via one of the bridges, or; accessing any bridge without crossing to its other end; are explicitly unacceptable. Euler proved that the problem has no solution.
Well-known river-crossing puzzles include: The fox, goose, and bag of beans puzzle, in which a farmer must transport a fox, goose and bag of beans from one side of a river to another using a boat which can only hold one item in addition to the farmer, subject to the constraints that the fox cannot be left alone with the goose, and the goose cannot be left alone with the beans.
The St. Croix Crossing is an extradosed bridge that spans the St. Croix River, between Oak Park Heights, Minnesota and St. Joseph, Wisconsin.Connecting Minnesota State Highway 36 and Wisconsin State Highway 64, the bridge carries four lanes of traffic (two lanes in each direction), and includes a bike/pedestrian path on the north side.
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An extradosed bridge employs a structure that combines the main elements of both a prestressed box girder bridge and a cable-stayed bridge. [1] [2]: 85 [3] The name comes from the word extrados, the exterior or upper curve of an arch, and refers to how the "stay cables" on an extradosed bridge are not considered as such in the design, but are instead treated as external prestressing tendons ...
Llanwrthwl Bridge Yr Allt Farm bridge Farm access Newbridge-on-Wye Bridge Brynwern Bridge Builth Road Railway Bridge Near Builth Road railway station. Located on the Heart of Wales Line. Wye Bridge, Builth Wells II: Builth Wells: Erwood Bridge Erwood: Carries the B4594 road. Lady Milford's Bridge - Llanstephan: Boughrood Bridge II: Glasbury ...
Site of Boston and Lowell Railroad Charles River Bridge, built 1835, first movable railroad bridge in the United States [3 42°22′8.29″N 71°03′54.96″W / 42.3689694°N 71.0652667°W / 42.3689694; -71.0652667 ( MBTA Commuter