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Citi Quantitative Analyst Interview Question (student candidate)

I interviewed in Philadelphia, PA and was asked:
"Burn two ropes, one needs 60 minus, another needs 30. How to get 45 minus time."
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Part of a Quantitative Analyst Interview Review - one of 866 Citi Interview Reviews

Answers & Comments

of 1

first burn the 60mins rope, fire it in both ends, after finish,30 minutes has past, then burn the other rope also start to burn on both ends. After finish, total time is 45min

- pwseason on Feb 28, 2013
of 1

Imagine 60 minute rope is divided into 60 segments. Cut off a length of 15 segments from the rope and tie it to the 30 minute one. Then both will finish burning after 45 minutes.

- JL on Feb 19, 2014

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