# This Impossible Bridge Riddle Will Test Your Reasoning Ability To The Max

Riddle solving is a useful way to test the analytical ability of your mind. Since engineers also tend to be competitive about everything, how about an intriguing riddle challenge that will challenge your minds in a good way? Here it is:

Four people are running away from zombies. They have seventeen minutes to cross a bridge that will take them to safety. The bridge is able to hold a maximum of two persons at the same time, and one of them has to cross while holding a lantern because otherwise the visibility is poor. The four people include you who can cross the bridge at one time, a lab attendant who can cross the bridge in two minutes, a janitor who can cross in five minutes and the old professor who can cross in ten minutes. All four people have to be safe across the bridge by the end of seventeen minutes or else a zombie will step on it and break it. There are no tricks involved like swimming or going gangsta against the zombies like Resident Evil. Your only retribution is pure logic.

While there are more challenging riddles available in the market, this is an interesting one because of the lantern. It is necessary while crossing the bridge. The game is all about the position of yourself, the lab attendant and the lantern. So, give a deep thought and don’t forget to save your university fellows. Although I wouldn’t mind leaving the professor behind if he had been grilling you in academics. The old guy is too slow anyway and will get the rest of you killed!

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First to go: me and the lab assistant, 2 mins. I come back with the lamp in 1 min. Total of 3 mins.
2nd, the professor and the janitor crosses the bridge in 10 mins then the lab assistant comes back for me with the lamp in 2 mins. Total of 12 mins.
We then cross the bridge in 2 mins.

So, 3+12+2 = 17 minutes

Just enough time to cut the rope.

Not so impossible after all, huh?

The Lab assistant carries the professor and lantern across in 2 minutes then returns and carries the janitor across and returns. 8 minutes have passed. I carry the lab assistant across. 9 minutes have passed.

1+2=2 minutes go across
1 minute back
5+10= 10 minutes go across
2 minutes back
2+1=2 minutes go across

At first 1 and 2 than 1 go’s back and 5 and 10 go then 2 come’s back. And 1and 2 go again.

first 1 and 2 will cross bridge = 2 min
next 1 will go back = 3 min
next 10 and 5 will go = 13 min
next 2 will go back = 15 min
next 1 ,2 = 17 min

me+lab attendant -2
me -1
janitor + professor -10
lab attendant -2
me+lab attendant -2