Snail in Well riddle

A snail is at the bottom of a well that is 20 meters in depth. Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. How many days must elapse till the snail reaches the top of the well?

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SherlockHolmes Expert Asked on 25th August 2018 in Interview Puzzles.
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  • 2 Answer(s)

    Answer:
    15 days must elapse.
    Snail reaches the top of the well on the 16th day

    Explanation:

    Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards.
    Hence, at the end of the day, the snail climbs up only by 1 meter.  1 entire day = 1 meter.
    So it would require 15 entire days to reach up by 15 meters.
    On the 16th day,  during the day-time, the snails reaches the top of the well ( 15 + 5 = 20
    ).
    As the snail has already reached the top of the well, it won’t slide down at night.

    SaintlyZero Guru Answered on 26th August 2018.
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    15 Days

    Seeker008 Expert Answered on 26th August 2018.
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