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 question is…
what is d total minimum time required by all 4 friends to cross the bridge….?
Scratch your brains…
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