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What is the average speed of an automo- bile as it travels the 300 mi

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What is the average speed of an automo- bile as it travels the 300 mi [#permalink]

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New post 07 Feb 2018, 04:52
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What is the average speed of an automobile as it travels the 300 miles between city A and city B ?

(1) The automobile averages 50 miles per hour for the first three hours.

(2) The automobile averages 45 miles per hour for the last three hours.
[Reveal] Spoiler: OA

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Re: What is the average speed of an automo- bile as it travels the 300 mi [#permalink]

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New post 07 Feb 2018, 06:39
What is the average speed of an automobile as it travels the 300 miles between city A and city B ?

(1) The automobile averages 50 miles per hour for the first three hours.
Knowing the average speed of just one part of the journey(where he covers
3*50 = 150 miles) is not going to be enough to find the average speed that
the automobile travels at. (Insufficient)

(2) The automobile averages 45 miles per hour for the last three hours.
Knowing the average speed of just one part of the journey(where he covers
3*45 = 135 miles) is not going to be enough to find the average speed that
the automobile travels at. (Insufficient)

On combining the information from both the statements, we have the average speeds
of around 285 miles traveled. Without knowing the average speed at which he travels
the remaining 15 miles, we cannot come up with the average speed (Insufficient - Option E)
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Re: What is the average speed of an automo- bile as it travels the 300 mi   [#permalink] 07 Feb 2018, 06:39
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