Four friends need to cross a dangerous 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?

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TopNewestanswer 17 minutes

– Krishana Kant Pareek · 2 years, 3 months agoLog in to reply

answer 21 minutes – Raghunathan N. · 2 years, 9 months ago

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