Only people with a high IQ can solve the ‘bridge brainteaser’ in 30 seconds

A tricky brain teaser can only be solved by people with a high IQ in 30 seconds or less.

The ‘Rickety Bridge’ test is a scenario where four people try to cross a dilapidated bridge at night, but they only have one flashlight between them.

Only two people can cross the bridge at a time and without traffic lights it is too dangerous to cross.

The puzzle challenges participants to find the fastest way for four of them to cross the bridge.

The Rickety Bridge Test asks people to answer the question of how a group of four people can cross the street at night if they only have one flashlight. Many people quickly assume the answer is simple, but the brain teaser requires people to ignore their initial answer by rationalizing the answer

‘The bridge is too old, so only two people can cross it at a time. They only have one flashlight.

‘They each take 1, 2, 5 and 10 minutes to cross the bridge, and they always go at the pace of the one who is slowest (if A and B cross, it takes 2 minutes).

‘What is the shortest time it will take for the four of them to cross the bridge?’

The organization Geeks for Geeks, which published The question provided a clue, telling readers that they could not walk around the bridge and shine the flashlight from the other side.

For those who tried to solve the problem quickly within the given time, the organization warned that the answer is not 21 minutes.

Most people would think that the fastest person to reach the other side in one minute would have to lead the others across the bridge. But Geeks for Geeks warned that this is not true.

If the person who had one minute were to lead each person across one by one, the problem would look like this: 10 + 1 + 7 + 1 + 2 = 21 minutes.

“That would make this question easy even as a warm-up question,” Geeks for Geeks said.

There is a quick way to get all four people across the rickety bridge, but to do that, readers must find a way to get the 10 and 7 across the bridge at the same time first, since they are the slowest of the group.

There is a faster way to get all four characters across the bridge, but it requires readers to find a way to get characters 10 and 7 across the bridge at the same time first, since they are the slowest of the group.

If they were to cross the bridge together, one of them would have to go back to the other side of the bridge to pick up someone else.

To get around this problem, one and two must cross the bridge first, and two must return to the other side first.

Then seven and ten cross, allowing the one-minute person with the flashlight to come back and take the two-minute person to the other side.

Total time: 2 + 2 + 10 + 1 + 2 = 17 minutes.

These types of math brain teasers stimulate the brain, helping people develop their visual and spatial reasoning skills.

It requires the person to think logically to answer the question correctly. This strengthens the connections between the person’s brain cells, improves thinking speed, and can improve short-term memory.

Research has shown that brain teasers increase people’s intelligence levels. Research has shown that people who work on challenging puzzles for at least 25 minutes every day can improve their IQ by as much as four points.