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If the speed limit along an 10-mile section of rail track is reduced

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If the speed limit along an 10-mile section of rail track is reduced  [#permalink]

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New post 26 Sep 2018, 04:08
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Difficulty:

  15% (low)

Question Stats:

81% (01:17) correct 19% (00:54) wrong based on 31 sessions

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If the speed limit along an 10-mile section of rail track is reduced from 50 miles per hour to 40 miles per hour. Approximately how many minutes more will it take a rail to travel along this section at the new speed limit than it would have taken at the old speed limit?

(A) 3
(B) 5
(C) 8
(D) 10
(E) 12

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Re: If the speed limit along an 10-mile section of rail track is reduced  [#permalink]

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New post 27 Sep 2018, 05:59
Bunuel wrote:
If the speed limit along an 10-mile section of rail track is reduced from 50 miles per hour to 40 miles per hour. Approximately how many minutes more will it take a rail to travel along this section at the new speed limit than it would have taken at the old speed limit?

(A) 3
(B) 5
(C) 8
(D) 10
(E) 12


T1 = distance/time = 10/50 = 1/5*60 minutes = 12

T2 = 10/40 *60 minutes = 15 minutes.

T2 - T1 = 3 minutes.

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Re: If the speed limit along an 10-mile section of rail track is reduced  [#permalink]

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New post 27 Sep 2018, 06:06
Bunuel wrote:
If the speed limit along an 10-mile section of rail track is reduced from 50 miles per hour to 40 miles per hour. Approximately how many minutes more will it take a rail to travel along this section at the new speed limit than it would have taken at the old speed limit?

(A) 3
(B) 5
(C) 8
(D) 10
(E) 12


Difference in time = \(\frac{10}{40}- \frac{10}{50}\)

Difference in time = \(0.05\) Hours = 3 Hours, Answer must be (A)
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Re: If the speed limit along an 10-mile section of rail track is reduced &nbs [#permalink] 27 Sep 2018, 06:06
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