Puzzle | Snail and Wall

A snail wishes to reach a water's shore. To do this, it must cross a wall that is 30 feet high. It has a time limit of 30 hours to reach the top of the wall. The time starts as soon as it starts climbing the wall. However, it faces a problem while climbing. Every hour, it climbs the wall 3 feet up, and it slides down 2 feet. This occurs every hour. So, how many hours will it take for the snail to reach the top of the wall?

Check if you were right - full answer with solution below.

Solution:

Let's think this thoroughly!

1. Every hour the snail climbs up 3 feet, it slides down 2 feet. So, the actual height it is climbing in 1 hour is 1 foot.
2. Similarly, in 25 hours, the snail would have climbed 25 feet, in 26 hours it would have climbed 26 feet and in 27 hours it would have climbed 27 feet, but things change after 27 feet.
3. As we know, the snail covers 3 feet up in 1 hour. So, in the 28th hour, the snail would have climbed 30 feet up the wall and would have reached top of the wall. Therefore the answer to this riddle is 28 hours.