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# DS: GMAT Prep Q9

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VP
Joined: 02 Jun 2006
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DS: GMAT Prep Q9 [#permalink]  16 Jul 2006, 17:11
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Can someone explain the solution to me? Will post OA in 24 hrs.
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Senior Manager
Joined: 02 May 2004
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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
VP
Joined: 25 Nov 2004
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Re: DS: GMAT Prep Q9 [#permalink]  16 Jul 2006, 17:34
A.

from 1, it is 60/11=5.55 miles.
from 2, it could be > 6 or <6.
VP
Joined: 02 Jun 2006
Posts: 1267
Followers: 2

Kudos [?]: 42 [0], given: 0

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
Senior Manager
Joined: 22 May 2006
Posts: 375
Location: Rancho Palos Verdes
Followers: 1

Kudos [?]: 28 [0], given: 0

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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The only thing that matters is what you believe.

Senior Manager
Joined: 07 Jul 2005
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Location: Sunnyvale, CA
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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.
VP
Joined: 02 Jun 2006
Posts: 1267
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Kudos [?]: 42 [0], given: 0

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 !!!

#&$*% need to kick my own ass... Manager Joined: 29 May 2006 Posts: 121 Followers: 2 Kudos [?]: 7 [0], given: 0 [#permalink] 16 Jul 2006, 18:12 haas_mba07 wrote: I just realized the mistake I made... and its got to be the stupidest one as yet for me!!!! I computed 1/2 hr as 30 x 30 seconds = 900seconds instead of 30x60 = 1800 !!! #&$*% need to kick my own ass...

Man, I have made worse mistakes. Hopefully I will keep them in check on gday!
VP
Joined: 02 Jun 2006
Posts: 1267
Followers: 2

Kudos [?]: 42 [0], given: 0

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...

Man, I have made worse mistakes. Hopefully I will keep them in check on gday!
VP
Joined: 25 Nov 2004
Posts: 1495
Followers: 6

Kudos [?]: 38 [0], given: 0

Re: DS: GMAT Prep Q9 [#permalink]  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.
Senior Manager
Joined: 12 Mar 2006
Posts: 367
Schools: Kellogg School of Management
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Kudos [?]: 36 [0], given: 3

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
Intern
Joined: 04 May 2006
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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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# DS: GMAT Prep Q9

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