Most people get this one wrong. Four people need to cross a bridge at night. They have one torch, and at most two people can cross at a time. Whoever crosses together moves at the slower person’s speed. Crossing Times: 1, 2, 7, and 10 minutes. What’s the fastest they can all get across? ⬇️ Solution Use the two fastest people to shuttle the torch. 1 & 2 cross → 2 min 1 returns → 1 min 7 & 10 cross → 10 min 2 returns → 2 min 1 & 2 cross → 2 min Total = 17 minutes The trick is minimizing how often the slowest people cross. #brainteaser #brainteasers #financeinterview #interviewtips #wallstreet