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What was John's average driving speed in miles per hour during a 15-mi

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What was John's average driving speed in miles per hour during a 15-mi [#permalink] New post  15 Dec 2018, 07:03
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15% (low)

Question Stats:

73% (00:46) correct 27% (00:51) wrong based on 342 sessions

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What was John's average driving speed in miles per hour during a 15-minute interval?

(1) He drove 10 miles during this interval.
(2) His maximum speed was 50 miles per hour and his minimum speed was 35 miles per hour during this interval.
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atshy21saraf
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Re: What was John's average driving speed in miles per hour during a 15-mi [#permalink] New post  21 Dec 2018, 10:31
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Average Speed= Total Distance traveled/Total Time

(1) He drove 10 miles during this interval
Total Time 15 mins. (given)
Total Distance= 10 miles
We have sufficient info with this.

Sufficient

(2) His maximum speed was 50 miles per hour and his minimum speed was 35 miles per hour during this interval.
This would not help as avg. speed does not come simply taking average of speeds.

Not Sufficient

Ans.: A
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Kavya9010
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Re: What was John's average driving speed in miles per hour during a 15-mi [#permalink] New post  06 Mar 2023, 23:35
1) We have total distance & total time, hence we can get Avg. Speed directly

2) As we just know the the maximum & minimum speed but don’t know for how much distance or time it was maintained hence cannot get avg speed

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Re: What was John's average driving speed in miles per hour during a 15-mi [#permalink]
06 Mar 2023, 23:35
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