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




Similar Riddles

We know that money can be names differently for the purpose it is used for. Some of the examples of money given at following places or for following activities:

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Can you figure out the logic I used to decide the order of the following words:
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Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.