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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]

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New post 15 Dec 2018, 07:03
3
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

74% (00:39) correct 26% (01:04) wrong based on 79 sessions

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Project DS Butler: Day 40: Data Sufficiency (DS80)


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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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Re: What was John's average driving speed in miles per hour during a 15-mi  [#permalink]

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New post 21 Dec 2018, 10:31
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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Re: What was John's average driving speed in miles per hour during a 15-mi   [#permalink] 21 Dec 2018, 10:31
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What was John's average driving speed in miles per hour during a 15-mi

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