You have two ropes that each take 1 hour to burn (unevenly). How do you measure 45 minutes?
Light both ends of one, one end of other
The answer
Light rope A at both ends + rope B at one end. When A burns out (30 min), light B's other end. B finishes in 15 more min. Total: 45 min.
Source: Verified
- logic-riddles
More from Logic & Riddles
- A bat and ball cost $1.10. The bat costs $1 more than the ball. What does the ball cost?
- If 5 machines take 5 minutes to make 5 widgets, how long for 100 machines to make 100 widgets?
- A lily pad doubles in size every day. It covers the lake in 48 days. When was it half covered?
- A farmer has 17 sheep. All but 9 die. How many are left?
- Two fathers and two sons go fishing. They catch 3 fish, one each. How?
- A man runs a mile south, mile east, mile north, ends where he started. Where is he?