Citi Interview Question: Burn two ropes, one needs 60 ... | Glassdoor

Interview Question

Quantitative Analyst Interview(Student Candidate) Philadelphia, PA

Burn two ropes, one needs 60 minus, another needs 30. How

  to get 45 minus time.

Interview Answer

2 Answers


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

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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