Trickier version of popular "Snail and wall" interview puzzle

#Hard #Tricky #Puzzle #riddle You may already know the snail and wall puzzle... but in this video I am going to show you a trickier version of this puzzle that can easily trap anyone in an interview. The interviewer will first ask you the basic question: There's a 10 meter high wall. A snail is at the bottom of the wall ... it climbs up 2 meters in one hour ... Then it rests for the next hour... and while resting, it slides down one meter... it continues the same pattern until it reaches the top. How long will it take for the snail to reach the top of the wall.... Of course the interviewer is expecting you to tell the wrong answer as 20 hours... because... Eventually, for every two hours it climbs up just one meter... so to climb up 10 meters height, it would take 20 hours... But since you know how to solve this puzzle... you would explain that by the end of 16 hours.. it has climbed up 8 meters... and in the next hour... it climbs up the remaining 2 meters to complete 10 meters... and it just reaches the top of the wall. And now it doesn't have to slide back again... because it has already reached the top. So.... the answer is .. 17 hours. The interviewer would congratulate you for this correct answer... and he would continue with his next puzzle. Now the snail is at the top of the wall.... If it follows the same pattern of climbing down for one hour and resting for next hour...and so on... how many hours does the snail take to reach the bottom of the wall? I'd like to thank Tamir Erez for sharing this deadly interview trap. I highly encourage you to pause the video and think logically. If your answer is six and a half hours... then you have been successfully trapped by the interviewer... The solution is trickier than expected. ----------------- You are most welcome to share puzzle, math problems or any topics for upcoming videos. Gmail : [email protected] Facebook(message) :   / mohammmedammar