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On a recent trip, Mary drove 50 miles. What was the average

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Status: Don't watch the clock,Do what it does, Keep Going.
Joined: 10 Jan 2017
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Re: On a recent trip, Mary drove 50 miles. What was the average [#permalink]

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New post 18 Sep 2017, 04:47
Average speed = Total distance / total time
1. total distance=50 now, time for both the cases can be calculated as speed and distance are mentioned thus total time is known . Sufficient
2. Total time given total distance is known. Sufficient
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Re: On a recent trip, Mary drove 50 miles. What was the average [#permalink]

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New post 03 Apr 2018, 10:13
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Bunuel wrote:
On a recent trip, Mary drove 50 miles. What was the average speed at which she drove the 50 miles?

(1) She drove 30 miles at an average speed of 60 miles per hour and then drove the remaining 20 miles at an average speed of 50 miles per hour.
(2) She drove a total of 54 minutes.


Target question: What was Mary's average speed for the 50-mile trip?
Average speed = (total distance)/(total travel time)
= (50 miles)/(total travel time)

As you can see, we need only determine the total travel time in order to answer the target question.

Statement 1: She drove 30 miles at an average speed of 60 miles per hour and then drove the remaining 20 miles at an average speed of 50 miles per hour.
For both parts of her journey, we COULD determine the travel time, so we COULD find the total travel time, which means we COULD calculate Mary's average speed
Since we COULD answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: She drove a total of 54 minutes.
Perfect! Her total travel time is 54 minutes, so we COULD calculate Mary's average speed
Since we COULD answer the target question with certainty, statement 2 is SUFFICIENT

Answer: D

Cheers,
Brent
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Brent Hanneson – Founder of gmatprepnow.com

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Re: On a recent trip, Mary drove 50 miles. What was the average   [#permalink] 03 Apr 2018, 10:13

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