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DS: GMAT Prep Q9

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DS: GMAT Prep Q9 [#permalink]

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New post 16 Jul 2006, 17:11
00:00
A
B
C
D
E

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Can someone explain the solution to me? Will post OA in 24 hrs.
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New post 16 Jul 2006, 17:27
B...

This is one of those pain in the butt problems
Not hard, but you need to just calculate out the rate
If you aren't careful, this is one you can make a stupid mistake on..i.e. bad calculation

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Re: DS: GMAT Prep Q9 [#permalink]

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New post 16 Jul 2006, 17:34
A.

from 1, it is 60/11=5.55 miles.
from 2, it could be > 6 or <6.

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New post 16 Jul 2006, 17:36
I picked B too.. :-(

jamesrwrightiii wrote:
B...

This is one of those pain in the butt problems
Not hard, but you need to just calculate out the rate
If you aren't careful, this is one you can make a stupid mistake on..i.e. bad calculation

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New post 16 Jul 2006, 17:50
6miles = 5280*6 = 31680ft
1/2hour = 1800sec.

distance = time*spd

stmt 1. spd > 16 ft/sec
so, distance > 16*1800 = 28800
insuff.

stmt2. spd < 18 ft/sec
so, distance < 18*1800 = 32400
insuff.

stmt1+stmt2 28800 < distance < 32400 but, still insuff.

ans E
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New post 16 Jul 2006, 17:50
haas_mba07 wrote:
sgrover, can you explain?

sgrover wrote:
(E)..


6 miles = 6 * 5280 = 31680 ft.

I. speed > 16 .. minm distance = 16*1800 = 28800 .. we dont know whether its more than 31680 or not.

II. speed < 18, maxm = 18*1800 = 32400 ..dont know if thats more than 31680 or not..

Combining, it can be less than 31680 or more.. (note that spped can be real)..
E.

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New post 16 Jul 2006, 18:02
I just realized the mistake I made... and its got to be the stupidest one as yet for me!!!!

I computed 1/2 hr as 30 x 30 seconds = 900seconds instead of 30x60 = 1800 !!!


#&$*% need to kick my own ass... :x

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New post 16 Jul 2006, 18:12
haas_mba07 wrote:
I just realized the mistake I made... and its got to be the stupidest one as yet for me!!!!

I computed 1/2 hr as 30 x 30 seconds = 900seconds instead of 30x60 = 1800 !!!


#&$*% need to kick my own ass... :x


Man, I have made worse mistakes. Hopefully I will keep them in check on gday!

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New post 16 Jul 2006, 18:21
I hope the same ... :-) Did you setup your G-Day?


walletless wrote:
haas_mba07 wrote:
I just realized the mistake I made... and its got to be the stupidest one as yet for me!!!!

I computed 1/2 hr as 30 x 30 seconds = 900seconds instead of 30x60 = 1800 !!!


#&$*% need to kick my own ass... :x


Man, I have made worse mistakes. Hopefully I will keep them in check on gday!

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Re: DS: GMAT Prep Q9 [#permalink]

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New post 16 Jul 2006, 19:06
MA wrote:
A.

from 1, it is 60/11=5.55 miles.
from 2, it could be > 6 or <6.


ooopppps its E. i read like 16 fps.

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New post 16 Jul 2006, 19:18
from 1 i get

total distance > (16/5280)*3600/2 = 60/11

so 1 is not sufficient

from 2 i get

total distance < (18/5280)*3600/2 = 24.5.../4 which is greater than 6


so we have 60/11 < total distance < 6.something

E

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New post 17 Jul 2006, 10:35
A.

From 1 we know that he could not have gone that far
from 2 he either could or coult not have gone that far

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  [#permalink] 17 Jul 2006, 10:35
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