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

Author Message
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Director
Joined: 28 Jul 2011
Posts: 566
Location: United States
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How many hours did it take helen to drive from her house to [#permalink]  25 Oct 2011, 23:20
00:00

Difficulty:

35% (medium)

Question Stats:

72% (01:24) correct 28% (00:20) wrong based on 36 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.
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Kudos [?]: 73 [0], given: 0

Re: Time taken [#permalink]  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
Joined: 28 Jul 2011
Posts: 566
Location: United States
GPA: 3.86
WE: Accounting (Commercial Banking)
Followers: 2

Kudos [?]: 97 [0], given: 16

Re: Time taken [#permalink]  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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