Puzzle 1 | (How to Measure 45 minutes using two identical wires?)
How do we measure forty-five minutes using two identical wires, each of which takes an hour to burn? We have matchsticks with us. The wires burn non-uniformly. So, for example, the two halves of wire might burn in 10 minutes and 50 minutes respectively
If we light a stick, it takes 60 minutes to burn completely. What if we light the stick from both sides? It will take exactly half the original time, i.e. 30 minutes to burn completely.
- 0 minutes – Light stick 1 on both sides and stick 2 on one side.
- 30 minutes – Stick 1 will be burnt out. Light the other end of stick 2.
- 45 minutes – Stick 2 will be burnt out. Thus 45 minutes is completely measured.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above
My Personal Notes arrow_drop_up
Please Login to comment...