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How many hours did it take helen to drive from her house to

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Director
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Joined: 28 Jul 2011
Posts: 582
Location: United States
Concentration: International Business, General Management
GPA: 3.86
WE: Accounting (Commercial Banking)
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How many hours did it take helen to drive from her house to [#permalink] New post 25 Oct 2011, 23:20
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Difficulty:

  35% (medium)

Question Stats:

76% (01:23) correct 24% (00:31) wrong based on 25 sessions
How many hours did it take helen to drive from her house to her parent's house?

1. Helen's average speed on this trip was 72 Km/hr

2. If Helen's average speed on this trip had been 8 Km/hr greater it would have taken 1 hr less

can anyone explain?
[Reveal] Spoiler: OA

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Status: Meh, I can't take the GMAT before 2017.
Joined: 20 Aug 2011
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Re: Time taken [#permalink] New post 26 Oct 2011, 02:07
kotela wrote:
How many hours did it take helen to drive from her house to her parent's house?

1. Helen's average speed on this trip was 72 Km/hr

2. If Helen's average speed on this trip had been 8 Km/hr greater it would have taken 1 hr less

can anyone explain?


let time req. be t.
let distance covered be d.

1.
d/t=72.
Insufficient

2.
d/(t-1)=80
Insufficient

1+2
d=72t
d=80(t-1)
72t=80(t-1)
Sufficient
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Last edited by blink005 on 26 Oct 2011, 06:15, edited 1 time in total.
Director
Director
avatar
Joined: 28 Jul 2011
Posts: 582
Location: United States
Concentration: International Business, General Management
GPA: 3.86
WE: Accounting (Commercial Banking)
Followers: 1

Kudos [?]: 55 [0], given: 16

Re: Time taken [#permalink] New post 26 Oct 2011, 04:42
Thanx for the explanation
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Re: Time taken   [#permalink] 26 Oct 2011, 04:42
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