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You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

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Replies to This Discussion

first ligh one string by both the ends and other string by other end

so that first string will burn completely in half hr i.e 30min and at the same time other string will burn exacly half...that means in 30min one complete string and other half string will burn 

then ligh the string which is burnt half by other side also so it wil take mopre 15min to burn 

means 45 min

Hi Priyanka,

You are right.

Thanks,

Hi i can burn in this way 

1 string -- i will burn at the both ends so it will take 30 mins 

2. string -- i will break it so now it is two strings and i will burn both the strings at both the sides which will take only 15 mins

Regards

Sandeep

         

It is close to impossible to  derrive the decision as rate of burning at which the strings will burn is completely random and each string is different.

If anybody have other reviews then please respond.

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