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The runners on a cross country team ran a 5-mile race at ave

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The runners on a cross country team ran a 5-mile race at ave [#permalink] New post 27 May 2018, 09:47
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Question Stats:

63% (00:57) correct 36% (03:07) wrong based on 11 sessions
The runners on a cross country team ran a 5-mile race at average (arithmetic mean) speeds ranging from 4 miles per hour to 7 miles per hour, inclusive. Which of the following are possible race completion times for individual members of the team?

Indicate all such times.

A. 36 minutes

B. 48 minutes

C. 60 minutes

D. 75 minutes

E. 90 minutes

F. 120 minutes
[Reveal] Spoiler: OA

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Re: The runners on a cross country team ran a 5-mile race at ave [#permalink] New post 30 May 2018, 05:16
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Highest amount of time needed will be for 4 mph guy and lowest will be 7 mph guy.

At 4mph, it will take 75 min to travel 5 miles.
At 7mph, it will take 42.8 min to travel 5 miles.

As the question mentios inclusive, 75 min should also be included. Hence B, C and D
Re: The runners on a cross country team ran a 5-mile race at ave   [#permalink] 30 May 2018, 05:16
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The runners on a cross country team ran a 5-mile race at ave

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