River Crossing with one Torch

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

River Crossing with one Torch




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Please forgive me Jahanpanah. I arrived late because my child was crying and I had to calm him down, explained Birbal.
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Father, I want a cow, said Birbal.
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I want to drink its milk, now, now, now! said Birbal, imitating the voice of his child.
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Out of the Box

The phrase “thinking outside the box” was popularised from the solution to a topographical puzzle involving 9 dots in a box shape.