Four friends A, B, C, D

Need to cross a bridge..

A maximum of 2 people 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 ur brains... 😃

Take ur own time. This is tricky

#### Click here for Answer

First A and B will go. So 2 mins.Then B will come back. So 2 mins.

Then C and D will Go. So 10 mins.

Then A will come back. So 1 min.

Then A and B will Go. So 2 mins.

Hence in Total 2+2+10+1+2=17 Minutes.

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