Reply To: Sunday Puzzle thread
Bridge of sighs? (Sunday 7th December by Harry)
Yes it is possible for all to cross in 15 minutes, here is how:
Alf, Bill, Carl and Dick are needing to cross.
Alf takes charge and switchs the light on.
He then tells Bill to cross with him.
Alf then returns alone, gives torch to Carl,
he tells Carl and Dick to cross over together and asks
them to give the torch to Bill and send Bill back to him
Alf and Bill then cross over together again.
Now everyone is across and, as if on cue, the torch flickers and goes out!
Or if you prefer:
Label the people A, B, C and D.
1. A and B cross together : Torch time = 2 minutes
2. A returns with the torch : Torch time = 1 minute
3. C and D cross together : Torch time = 8 minutes
4. B returns with the torch : Torch time = 2 minutes
5. A and B cross together again : Torch time = 2 minutes
Total time: 2 + 1 + 8 + 2 + 2 = 15 minutes.
[solveded Monday evening 8/12/25]