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# Is the average speed of a car greater than 30 mph ? (1) The

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Manager
Joined: 02 Apr 2006
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Is the average speed of a car greater than 30 mph ? (1) The [#permalink]  10 Dec 2007, 05:25
Is the average speed of a car greater than 30 mph ?

(1) The distance is less then 3,500 miles
(2) The driving hour is greater than 100 hours

I have simply picked up the answer with a thought that I can get a speed once distance and time are given.. It was a too pure idea?

My choice is C.. but the answer is given as E.. I can't fully accept this, though... Please SOS..
VP
Joined: 09 Jul 2007
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Location: London
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Re: (D/S) the Average Speed of a Car.. [#permalink]  10 Dec 2007, 07:30
pretttyune wrote:
Is the average speed of a car greater than 30 mph ?

(1) The distance is less then 3,500 miles
(2) The driving hour is greater than 100 hours

V>30?

C cannot be. as

A. Distance can be 3499 and Time can be 101
then Speed can be 34.7. Yes.

B. Distance can be 3000 and Time can be 150
then speed can be 20 No

Director
Joined: 09 Aug 2006
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Re: (D/S) the Average Speed of a Car.. [#permalink]  10 Dec 2007, 09:12
pretttyune wrote:
Is the average speed of a car greater than 30 mph ?

(1) The distance is less then 3,500 miles
(2) The driving hour is greater than 100 hours

I have simply picked up the answer with a thought that I can get a speed once distance and time are given.. It was a too pure idea?

My choice is C.. but the answer is given as E.. I can't fully accept this, though... Please SOS..

E.

Is D/T > 30?

Stat 1: Doesn't tell us anything about T; insuff.

Stat 2: Doesn't tell us anything about D; insuff.

Together:
If D = 1, T = 200 then D/T <30> 30
Insuff.
Re: (D/S) the Average Speed of a Car..   [#permalink] 10 Dec 2007, 09:12
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