Medium – Page 25 – Puzzle Prime

Snail on a Tree

Section: Brain Teasers Category: Insight

Difficulty: Medium

A snail is trying to climb a 10-meter poll. Every day it climbs 4 meters up and then during the night slides 3 meters down. How many days are needed for the snail to get to the top of the poll?

SOLUTION

Seven days only. After the sixth day, the snail would have climbed 6 meters. During the seventh day, it will climb 4 more meters and will get to the top.

Unknown Author February 4, 2017

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Running Dog

Section: Brain Teasers Category: Insight

Difficulty: Medium

Two people – Mick and Goof, 100 meters apart, start walking towards each other with constant speeds of 2m/s. At the same time Mick’s dog starts running back and fourth between them with constant speed of 6m/s until Mick and Goof meet. How much distance does the dog cover in total?

SOLUTION

Mick and Goof will meet after 100/(2 + 2) = 25 seconds. Therefore the dog will run for 25 seconds and will cover 6 x 25 = 150 meters in total.

Unknown Author January 16, 2017

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