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# PS> speed limit

Author Message
Manager
Joined: 12 Feb 2008
Posts: 176

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30 Jan 2009, 13:45
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 2 sessions

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Due to construction, the speed limit along an 8-mile section of highway is reduced from 55 miles per hour to 35 miles per hour. Approximately how many minutes more will it take to travel along this section of highway at the new speed limit than it would have taken at the old speed limit ?
(A) 5
(B) 8
(C) 10
(D) 15
(E) 24

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Senior Manager
Joined: 30 Nov 2008
Posts: 479
Schools: Fuqua

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30 Jan 2009, 13:53
1
IMO A. Here is my solution

Hypothetical scenario -

Rate = 55 miles / hour
Distance = 8 miles
Time = distace / rate = 8/55 hours.

Actual Scenario
Rate = 35 miles / hour
Distance = 8 miles
Time = distace / rate = 8/35 hours.

Question to be answered is Actual Time - Hypotherical time = (8/35 - 8/55) * 60 which gives an approximately 5 min. (I multipled 6o since the time we have is in hours and this need to be converted to min).
Manager
Joined: 12 Feb 2008
Posts: 176

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30 Jan 2009, 14:13
thanks, you got your first kudos:)

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Re: PS> speed limit   [#permalink] 30 Jan 2009, 14:13
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