Mainframe, MVS and zOS Discussion

Posted: **Thu Feb 13, 2014 5:59 pm**

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....?

Posted: **Fri Feb 14, 2014 11:50 pm**

17 Minutes?

Posted: **Fri Feb 14, 2014 11:52 pm**

21 minutes.

Posted: **Fri Feb 14, 2014 11:52 pm**

How come?

Explain please

Posted: **Sat Feb 15, 2014 12:11 am**

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

Posted: **Sat Feb 15, 2014 12:36 am**

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

Posted: **Sat Feb 15, 2014 12:46 am**

oops, Robert!

- valentine's day effect!

Posted: **Sat Feb 15, 2014 1:14 am**

Good one all :-)

Next week - I will come up with another puzzle and will also declare the correct answer for this puzzle

Posted: **Thu Feb 20, 2014 8:21 pm**

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

...

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