Crossing the Bridge at Night

#bridge#optimization#lateral#classic

HardAdults

0:00

Four people need to cross a dark bridge at night. They have one flashlight and the bridge can only hold two people at a time. Person A can cross in 1 minute, B in 2 minutes, C in 5 minutes, and D in 10 minutes. When two people cross together, they must go at the slower person's pace. What is the minimum time for all four to cross?

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