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PS> speed limit

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Manager
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Joined: 12 Feb 2008
Posts: 177

Kudos [?]: 47 [0], given: 0

PS> speed limit [#permalink]

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New post 30 Jan 2009, 13:45
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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

please provide reasoning for your answer

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Senior Manager
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Joined: 30 Nov 2008
Posts: 483

Kudos [?]: 367 [1], given: 15

Schools: Fuqua
Re: PS> speed limit [#permalink]

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New post 30 Jan 2009, 13:53
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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).

Kudos [?]: 367 [1], given: 15

Manager
Manager
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Joined: 12 Feb 2008
Posts: 177

Kudos [?]: 47 [0], given: 0

Re: PS> speed limit [#permalink]

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

Kudos [?]: 47 [0], given: 0

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