Four friends A, B, C, D need to cross a bridge

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Four friends A, B, C, D need to cross a bridge

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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