Puzzle of this week

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zprogrammer
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Puzzle of this week

Post by zprogrammer »

Four friends A, B, C, D

Need to cross a bridge..

A maximum of 2 peoples can cross at a time..

It was dark out there and they just have 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 , B , C , D

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 the total minimum time required by all 4 friends to cross the bridge....?
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Anuj Dhawan
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Re: Puzzle of this week

Post by Anuj Dhawan »

17 Minutes?
Thanks,
Anuj

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Robert Sample
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Re: Puzzle of this week

Post by Robert Sample »

21 minutes.
zprogrammer
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Re: Puzzle of this week

Post by zprogrammer »

How come?

Explain please
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enrico-sorichetti
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Re: Puzzle of this week

Post by enrico-sorichetti »

Code: Select all

A and B cross A returns (  2 + 1 )      3
C and D cross B returns ( 10 + 2 )     12
A and B cross                           2

total                                  17 
and everybody is happy
cheers
enrico
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Anuj Dhawan
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Re: Puzzle of this week

Post by Anuj Dhawan »

Code: Select all

A and B go across     :   2 minutes
B returns with flash  :   2 minutes
C and D go across     :  10 minutes
A returns with flash  :   1 minute
A and B go across     :   2 minutes
                          ----------
                         17 minutes
Thanks,
Anuj

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Anuj Dhawan
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Re: Puzzle of this week

Post by Anuj Dhawan »

oops, Robert! :) - valentine's day effect! :wink:
Thanks,
Anuj

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zprogrammer
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Re: Puzzle of this week

Post by zprogrammer »

Good one all :-)

Next week - I will come up with another puzzle and will also declare the correct answer for this puzzle :lol:
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Re: Puzzle of this week

Post by zprogrammer »

The correct answer is 17 Minutes also watch out for Puzzle of this week :) ...
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