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Mr. Wayne bungee jumps from the top of a building straight to the grou

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Mr. Wayne bungee jumps from the top of a building straight to the grou  [#permalink]

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New post 15 May 2015, 07:14
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Mr. Wayne bungee jumps from the top of a building straight to the ground at a constant speed. 3 seconds after he starts plummeting he passes the 20th floor. 15 seconds after he starts plummeting he passes the 5th floor. Each floor is 3 meters high. What is Mr. Wayne's speed in meters per second?

A. 3
B. 3.75
C. 4
D. 4.25
E. 5

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Re: Mr. Wayne bungee jumps from the top of a building straight to the grou  [#permalink]

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New post 15 May 2015, 14:56
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In the space of 12 seconds (between the 3rd and 15th second), he falls 15 floors (from the 20th to the 5th). So he is falling 15 floors every 12 seconds. Since each floor is 3 meters, he is thus falling 45 meters every 12 seconds, so he is falling at a speed of 45/12 meters per second. Since 45/12 = 15/4 = 3.75, that's the answer.
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Mr. Wayne bungee jumps from the top of a building straight to the grou  [#permalink]

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New post 15 May 2015, 23:18
IMO: B

15 Floors * 3 Meter/Floor = 45 Meters

Time= 12 sec

Rate * 12 = 45

Rate= 45/12
=3.75 :-D
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Re: Mr. Wayne bungee jumps from the top of a building straight to the grou  [#permalink]

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New post 22 Apr 2016, 11:08
IanStewart wrote:
In the space of 12 seconds (between the 3rd and 15th second), he falls 15 floors (from the 20th to the 5th). So he is falling 15 floors every 12 seconds. Since each floor is 3 meters, he is thus falling 45 meters every 12 seconds, so he is falling at a speed of 45/12 meters per second. Since 45/12 = 15/4 = 3.75, that's the answer.


Shouldn't the # of floors he goes down be (20-5)+1 floor? The answer would then be 4. Please advice...
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Re: Mr. Wayne bungee jumps from the top of a building straight to the grou  [#permalink]

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New post 10 Jun 2018, 12:52
Avinashs87 wrote:
IanStewart wrote:
In the space of 12 seconds (between the 3rd and 15th second), he falls 15 floors (from the 20th to the 5th). So he is falling 15 floors every 12 seconds. Since each floor is 3 meters, he is thus falling 45 meters every 12 seconds, so he is falling at a speed of 45/12 meters per second. Since 45/12 = 15/4 = 3.75, that's the answer.


Shouldn't the # of floors he goes down be (20-5)+1 floor? The answer would then be 4. Please advice...



Nopes... See he starts falling from 20 till 5.. that excludes 20, so you dont have to add 1.. it will be 20-5= 15 floors i.e. 45 metres and 12 seconds time.. thus 45/12 so the ans will be 3.75


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Re: Mr. Wayne bungee jumps from the top of a building straight to the grou &nbs [#permalink] 10 Jun 2018, 12:52
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