Question

Four soldiers need to cross a frozen river at night to get to the other side. The river has frozen so they can walk on ice, but at a time only 2 soldiers can go else the ice will break and they will fall into cold water and die. They must use light to reach to the other end and in this case they have a single mobile phone for the entire team to do that, but the light from mobile phone will last only 16 minutes. They must use light to cross the frozen river. Soldier 1 is young, he can cross in 1 min, soldier 2 is also strong but takes 2 mins, soldier 3 has sprain in 1 leg and takes 5 mins, and the soldier 4 has sprain in both legs and will take 9 mins. How can they all make it to the next side? ​

Answer 1

Answer:

By doing all calculation we can say that

In 1st round we need to send 1&2 it take 2min

Then 1 return with phone so it's take 1min

Then in 2nd round 3&4 needs to be go it take 9min

Then again 2nd needs to come with phone it take's 2min

In last 3rd round 1&2 needs to go again it take 2min

So the total time taken by all is 2+1+9+2+2 = 16

so we cross the river in 16 minutes

Answer 2

Answer:

The journey across the river takes us sixteen minutes.

Explanation:

After going through all of the calculations, we can get to the conclusion that it takes two minutes to send the numbers 1 and 2 in the first round.

After then, someone comes back with a phone, which takes one minute.

The third and fourth rounds of the second round need to be completed, which will take nine minutes total.

Having said that, the second person has to show up with a phone. Takes two minutes.

In the last round, which consists of rounds 1 and 2, and lasts for two minutes,

Therefore, the total amount of time needed is 2 plus 1 plus 9 plus 2 plus 2, which is 16.

Therefore, the journey across the river takes us sixteen minutes.

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