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After the rush-hour speed limit on the British M25 motorway was lowere

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After the rush-hour speed limit on the British M25 motorway was lowere  [#permalink]

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New post 30 Sep 2018, 23:00
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89% (01:18) correct 11% (02:01) wrong based on 54 sessions

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After the rush-hour speed limit on the British M25 motorway was lowered from 70 miles per hour (115 kilometers per hour) to 50 miles per hour (80 kilometers per hour), rush-hour travel times decreased by approximately 15 percent.

Which one of the following, if true, most helps to explain the decrease in travel times described above?


(A) After the decrease in the rush-hour speed limit, the average speed on the M25 was significantly lower during rush hours than at other times of the day.

(B) Travel times during periods other than rush hours were essentially unchanged after the rush‑hour speed limit was lowered.

(C) Before the rush-hour speed limit was lowered, rush-hour accidents that caused lengthy delays were common, and most of these accidents were caused by high-speed driving.

(D) Enforcement of speed limits on the M25 was quite rigorous both before and after the rush‑hour speed limit was lowered.

(E) The number of people who drive on the M25 during rush hours did not increase after the rush‑hour speed limit was lowered.

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Re: After the rush-hour speed limit on the British M25 motorway was lowere  [#permalink]

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New post 01 Oct 2018, 02:46
C is the answer imo as it talks about time delays due to accidents


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Re: After the rush-hour speed limit on the British M25 motorway was lowere  [#permalink]

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New post 01 Oct 2018, 04:28
We need to address the paradox in this question.
Even though the speed limit was lowered from 70mph to 50mph, travel times decreased.
One would expect travel time to increase but on the contrary it decreased.
Only option C addresses the paradox by stating that the reduction of speed limit reduced the no. of accidents which were the reason behind time delays earlier.

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Re: After the rush-hour speed limit on the British M25 motorway was lowere &nbs [#permalink] 01 Oct 2018, 04:28
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After the rush-hour speed limit on the British M25 motorway was lowere

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