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# How much time did it take a certain car to travel 400

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Manager
Joined: 07 Dec 2006
Posts: 167

Kudos [?]: 103 [0], given: 0

How much time did it take a certain car to travel 400 [#permalink]

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30 Jan 2008, 08:59
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Difficulty:

(N/A)

Question Stats:

100% (01:03) correct 0% (00:00) wrong based on 3 sessions

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How much time did it take a certain car to travel 400 kilometers?

1) The car traveled the first 200 kilometers in 2.5 hours.
2) If the car’s average speed had been 20 kilometers per hours greater than it was, it would have traveled the 400 kilometers in 1 hours less time than it did.

Kudos [?]: 103 [0], given: 0

Director
Joined: 01 Jan 2008
Posts: 618

Kudos [?]: 198 [0], given: 1

Re: DS . Average speed [#permalink]

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30 Jan 2008, 09:14
GHIBI wrote:
How much time did it take a certain car to travel 400 kilometers?

1) The car traveled the first 200 kilometers in 2.5 hours.
2) If the car’s average speed had been 20 kilometers per hours greater than it was, it would have traveled the 400 kilometers in 1 hours less time than it did.

1) insufficient - no info about second 200 km
2) sufficient

400/(t-1)-400/t = 20 -> t^2-t-20 = 0 -> t1=-4 (can't be negative), t2 = 5

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SVP
Joined: 28 Dec 2005
Posts: 1545

Kudos [?]: 179 [0], given: 2

Re: DS . Average speed [#permalink]

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30 Jan 2008, 21:11
stat 1 is insuff, we have no idea how long it took for the remaining 200 kms. could be 2 hrs, could be 3, 4, etc...

stat 2 is suff. s+20 = 400/t-1 , s=400/t

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Intern
Joined: 03 Mar 2007
Posts: 31

Kudos [?]: 6 [0], given: 0

Re: DS . Average speed [#permalink]

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31 Jan 2008, 15:10
You know right away to eliminate A and D as 1) only provides information for the first half of the trip

On a question like this I would immediately choose B and not engage in calculation as you have enough information in choice 2) without using any numbers thus saving a lot of time for harder questions

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Director
Joined: 01 May 2007
Posts: 795

Kudos [?]: 379 [0], given: 0

Re: DS . Average speed [#permalink]

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31 Jan 2008, 15:39
Would you say this is a harder question?

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Re: DS . Average speed   [#permalink] 31 Jan 2008, 15:39
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