There is 4 of you. You and three other friends. I will name your friends as A, B, C and yourself as U. You all are on an island and the island has a volcano. The volcano is about to explode, so you will have to leave. The only way off the island is by crossing over a 100ft broken bridge, it is nightime but you have a torch. There are Alligators at the bottom of the bridge who are waiting for one of you to fall. To cross the bridge it takes;
A 8 mins
B 5 mins
C 2 mins
U 1 mins
Giving you a total of 16mins. I need you to all cross the bridge in 15mins. Only 2 of you can go at anyone time and 1 person has to come back with the torch. You cannot take 3 in anyway and there is no catch to it. It is possible to take you all 4 across in 15mins.
If 8+5 go that will take 8 minutes and 5 returns that is 13 mins
If 2+5 go it will take you 5 mins and 2 returns that is 7 mins.
Keep adding and let me know how you get on.
2007-01-05 06:17:56 · 5 answers · asked by cybercranberry 2 in Education & Reference ➔ Trivia
That's easy
C+U go - 2 minutes
U go back - 1 min
A+B go - 8 min
C goes back - 2
C+U go- 2
That's a total of exactly 15 minutes
2007-01-05 07:07:04 · answer #1 · answered by ace_wins108 2 · 3⤊ 0⤋
You don't say that carrying somebody piggyback will alter their crossing time, so...
U crosses with C on his back and returns - 2 mins
U crosses with B on his back and returns - 2 mins, total of 4 mins
U crosses with A on his back
1 min, total of 5 mins
2007-01-05 07:41:54 · answer #2 · answered by Anonymous · 0⤊ 0⤋
a+b=13
c=2min
and u fall =15 minutes
2007-01-05 06:35:23 · answer #3 · answered by ~♥~ *CHEEKY* ~♥~ 6 · 0⤊ 1⤋
you can't cross a broken bridge?
sorry friends...we're dead
2007-01-05 06:29:19 · answer #4 · answered by retired 6 · 1⤊ 0⤋
really cool riddle but im to stupid for that
2007-01-05 07:29:21 · answer #5 · answered by yankeesalltheway 3 · 0⤊ 1⤋