interviewer started with
oops principle
Object comparison
diff. bte string and stringbuffer
http request lifecycle
2 puzzles - did not strike me at time
-2 same candles - 1 burns in 1 hr.how will you measure 1 1/2 hr
-how will you tell weather a number can be represented in 2 raise to n like 4 can be writeen as 2square.

Question

interviewer started with 
oops principle
Object comparison
diff. bte string and stringbuffer
http request lifecycle
2 puzzles - did not strike me at time
-2 same candles - 1 burns in 1 hr.how will you measure 1 1/2 hr
-how will you tell weather a number can be represented in 2 raise to n like 4 can be writeen as 2square.

AK · Accepted Answer

I would rather burn the first canlde for 1 hour completely, then I will light up the second candle from both the ends. It should take the second candle to burn completely in 30 mins from both ends.

Sigiloso · Answer

Since each candle takes 60 mins to burn, total time taken to burn is 120 mins... But since we need to measure 1 1/2 hr which is 90 mins, it can be divided among the two candles in 45 mins each... so when they start burning simultaneously, each candle has to effectively burn for 45 mins i.e 45/60 = 3/4th... so when 3/4th portion is burnt we can say 90 mins has passed...

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