A snail is at the bottom of a 20 meters deep pit. Every day
the snail climbs 5 meters upwards, but at night it slides
4 meters.
The Question: How many days does it take before the snail
reaches the top of the pit?
January 13, 2011
Climbing Snail
A snail is at the bottom of a 20 meters deep pit. Every day
the snail climbs 5 meters upwards, but at night it slides
4 meters.
The Question: How many days does it take before the snail
reaches the top of the pit?
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16 comments:
16 days
15 and 1/2 day or you can say 16 days
On the 16th day he'll reach the top
20 days
being that every day it only gains 1 meter then it should be 20 days
its 16 days
on 14th day it would have dont its 14 feet journey...
on 15th - end of the DAY - it will touch 19 feet..
due to sliding it will come down to 15 th feet in the end of night
on 16th day it will reach 20th feet in day by travelling 4 feet...
But once he reaches the top of the pit (on the 16th day), why would he slide down again? He'd be on even ground! So it wouldn't be 20 days, it'd be 16, I think.
@swathi hope you aware of Gravity
I am aware of gravity, but gravity doesn't pull objects through EVEN ground. O_o
right when it reaches 20 th feet it also come to the end of the top
as you say it might take one more day ??(max) to reach top..
you right as it is in 20th there is chance to come down because i hasnt reached the even ground..
so 17 days
*to reach top to reach even place
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17 days to get out of the pit, but 16 days to reach the top of the pit.
Question says"reaches the top of the pit?" so the answer is 16 days not 17 days.
@ Baby Vincent.. in your answer you have said "on 16th day it will reach 20th feet in day by travelling 4 feet..." at end of the 15th day it was there at 15 feet height so it has to travel 5 feet to reach the top not 4 feet.
25 days.
@Editor: Are these puzzles being given out to you as home work or something? Just wondering, since you are either hesitant to publish the answer or not sure yourself.
16 days
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