There are totally 4 guys who want to cross one bridge from one end to other, but the problem is tht only two them at a time can walk on the bridge.
They are in dark jungle and have only one torch with them to cross the bridge.
following are the strength of each guy.
A person can walk the distance in 1 min
B person can walk the same in 2 min
C person can walk the distance in 5 min
D can walk in 10 min.
Now tell me how four of them will cross the bridge in 17 mins????????
2006-12-09 01:55:22 · 14 answers · asked by It's me 1 in Entertainment & Music ➔ Jokes & Riddles
a&b first=2
a back=1
d&cnext=10
b back=2
a&bnext=2
total=17
2006-12-09 02:09:35 · answer #1 · answered by Anonymous · 1⤊ 0⤋
A and B go across together 2 min
A returns with the torch 1 min
C and D now go across and gives the torch to B
10 min
B then goes back across 2 min
A and B cross together once more 2 min
Total 17 min
2006-12-09 02:01:16 · answer #2 · answered by ♣ My Brainhurts ♣ 5 · 2⤊ 0⤋
Person A and B walks across 2min
A comes Back with torch 1 min
C and D walk across 10min
B comes back with torch 2min
A and B walks across 2 min
Total 17min
my version person A pushes D off bridge as person D is too slow. saving lots of time.
2006-12-09 02:27:48 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Wait until daylight, then they just need 13 min to cross the bridge. or burn a stick in the jungle to make a torch then they also can cross the bridge in 13 min.
( the point is ; one must think outside the box to solve problem.)
2006-12-09 03:19:37 · answer #4 · answered by sly r 2 · 0⤊ 0⤋
If they all walk over together, two in front and two close behind, with the front pair holding the torch, they can all cross in 10 minutes.
2006-12-09 05:42:17 · answer #5 · answered by Iain C 3 · 0⤊ 0⤋
the 10minute guy goes first with the torch then the 1minute guy goes once the 1 minute guy has got across the 2minute guy goes and finishes then the 5 minute guy goes and finishes then 2 minutes later the 10minute guy finishes with the torch which has been lighting up the bridge.
2006-12-09 02:04:24 · answer #6 · answered by Big Boy 1 · 0⤊ 0⤋
throw person A off the bridge
2006-12-09 03:20:10 · answer #7 · answered by Anonymous · 0⤊ 0⤋
They all take a break and say heck with it well stay over here on this side of the bridge
2006-12-09 02:24:44 · answer #8 · answered by Beth B 5 · 0⤊ 0⤋
set up camp and cross the bridge in the morning
2006-12-09 03:00:11 · answer #9 · answered by vodka 4 · 0⤊ 0⤋
if the 10 minute one goes first the 2 minute guy can follow therefore two are on the bridge then the 5 minute guy can go then the i minute guy can go they all overlap
2006-12-09 02:00:29 · answer #10 · answered by Anonymous · 1⤊ 0⤋