While running in the race, did Jenny's speed ever exceed 9 : DS Archive
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# While running in the race, did Jenny's speed ever exceed 9

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While running in the race, did Jenny's speed ever exceed 9 [#permalink]

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05 Sep 2008, 02:50
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While running in the race, did Jenny's speed ever exceed 9 miles per hour?

(1) Jenny ran a total of 3.1 miles in the race
(2) Jenny completed the race in under 27 minutes
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Re: Zumit - DS - 003 [#permalink]

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05 Sep 2008, 03:00
I say E.

1) This only gives us distance. No way to find Distance/Time (R=W/T). NOT SUFF.
2) This only gives us time. No way to find Distance/Time (R=W/T). NOT SUFF.

Combine
We can find average speed (3.1/27*60=6.8mph). However, we still cannot tell if this was a constant speed for the duration of the race (where answer = "No") or if Jenny ran over 9 mph at one point and slower at other times (where answer = yes).
NOT SUFF

E.
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Re: Zumit - DS - 003 [#permalink]

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05 Sep 2008, 14:10
dancinggeometry wrote:
While running in the race, did Jenny's speed ever exceed 9 miles per hour?

(1) Jenny ran a total of 3.1 miles in the race Insuff
(2) Jenny completed the race in under 27 minutes Insuff

Under 27 min together with 3.1 miles means possibly 10 min or 26 min or 15 min for 3.1 miles. Hence E
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Re: Zumit - DS - 003 [#permalink]

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05 Sep 2008, 20:23
dancinggeometry wrote:
While running in the race, did Jenny's speed ever exceed 9 miles per hour?

(1) Jenny ran a total of 3.1 miles in the race
(2) Jenny completed the race in under 27 minutes

(1) no info about time taken INSUFFI
(2) no info about dist INSUFFI

(1)and (2) here we get the average speed but not the instantaneous speed at any moment hence INSUFFI cant say
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Re: Zumit - DS - 003 [#permalink]

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05 Sep 2008, 20:42
The OA is E. Tricky one!!
Re: Zumit - DS - 003   [#permalink] 05 Sep 2008, 20:42
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