Four friends A B C D Need to cross a bridge A maximum of 2 peoples can cross at a time It is night and they have just 1 lamp People that cross the bridge must carry the lamp to see the way A pair must walk together at the speed of slower person Speeds of: A: 1 minute to cross bridge B: 2 minutes to cross bridge C: 7 minutes to cross bridge D: 10 minutes to cross bridge Now the question is What is the total minimum time required by all 4 friends to cross the bridge?
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