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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.
Crossing Coordinates Built Heritage status Locality Notes Refs Image Source of the River Wye - Plynlimon: Included for completeness Y Drum Bridge grid reference: 1965 Pont Rhydgaled The first bridge over the Wye, 3.2 kilometres (2.0 mi) below its source.
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.
The Millau Viaduct is a cable-stayed road-bridge that spans the valley of the river Tarn near Millau in southern France. It opened in 2004 and is the tallest vehicular bridge in the world, with one pier's summit at 343 metres (1,125 ft). The viaduct Danyang–Kunshan Grand Bridge in China was the longest bridge in the world as of 2011. [6]
Kalilayan Bridge Padre Burgos–Agdangan National Road Kalilayan River in Unisan, Quezon: Calabarzon: 198 [89] 1984 [53] Lisap Bridge Francis Coronel Road Bongabong River in Bongabong, Oriental Mindoro: Mimaropa: 365 [90] 2018 [90] Old Lucban Bridge AH 26 (N1) (Manila North Road) Lucban River in Abulug, Cagayan: Cagayan Valley: 826.90 [91] 1968 ...
The Makati–Mandaluyong Bridge is a four-lane road bridge crossing the Pasig River between Makati and Mandaluyong in Metro Manila, Philippines. It connects P. Burgos Extension, a continuation of Makati Avenue in Poblacion, Makati, at the south bank of the river, to Coronado Street in Hulo, Mandaluyong, at its north bank. The bridge was opened ...
The English Bridge, with water levels at the Summer low. The English Bridge is a masonry arch viaduct, crossing the River Severn in Shrewsbury, Shropshire. The present bridge is a 1926 rebuilding and widening (re-using the original masonry) of John Gwynn's design, completed in 1774. A bridge is known to have stood at this spot since at least ...
The bridge took 20 years to complete and cost ₹ 3.88 billion (equivalent to ₹ 30 billion or US$350 million in 2023), [5] [7] but during seven of those years there was no construction activity. [5] The bridge is named after the 19th-century Bengali education reformer Pandit Ishwar Chandra Vidyasagar.