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Re: While flying across the country, did Karen ever exceed 650 miles per [#permalink]
Since the question is whether Karen ever exceeded 650 miles/hour,
we need to check, if her speed was ever over 650 miles/hour?

(1) Karen flew 3,000 miles.
Knowing the distance traveled will never be enough to determine if the speed was over or below 650.
Hence, this statement alone is insufficient.

(2) Karen flew for 5 hours.
Knowing the time alone, Karen takes to travel the distance, is never going to be enough to calculate the speed.
This statement alone is insufficient.

Combining both statements, we know she travels 3000 miles in 5 hours.
If she travels at a constant speed, we can clearly tell the speed never exceeded 650 miles/hour
However, if she doesn't travel at a constant speed(and since this information is never explicitly given in the question stem,
or either statements) we cant clearly tell if her speed exceeded 650 miles/hour for an hour or not.
Hence, combination statements are also insufficient (Option E)
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Re: While flying across the country, did Karen ever exceed 650 miles per [#permalink]
by reviewing both the statements we could say that it is not clear whether he traveled 650m/h or not . hence E , as speed is not constant here
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Re: While flying across the country, did Karen ever exceed 650 miles per [#permalink]
Expert Reply
Bunuel wrote:
While flying across the country, did Karen ever exceed 650 miles per hour?

(1) Karen flew 3,000 miles.
(2) Karen flew for 5 hours.


We need to determine whether Karen’s rate ever exceeded 650 mph.

Statement One Alone:

Karen flew 3,000 miles.

Since we do not know anything regarding her time, we cannot determine whether her rate was greater than 650 mph. Statement one alone is not sufficient to answer the question.

Statement Two Alone:

Karen flew for 5 hours.

Since we do not know anything regarding her distance, we cannot determine whether her rate was greater than 650 mph. Statement two alone is not sufficient to answer the question.

Statements One and Two Together:

Using statements one and two, we know that Karen flew 3,000 miles for 5 hours. While it may appear as though her rate was 3,000/5 = 600 mph, we do not know whether she flew at a constant rate. Thus, she could have flown the entire trip at 600 mph or she could have flown at a rate that was sometimes less than 600 mph and sometimes greater than 650 mph.

Answer: E
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Re: While flying across the country, did Karen ever exceed 650 miles per [#permalink]
I guess the plane must have took off directly at the speed of 600mph
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Re: While flying across the country, did Karen ever exceed 650 miles per [#permalink]
Correct Answer - E.

Distance = Rate x Time

I. This statement provides us the distance, but not the time. Not Sufficient.
II. This statement provides us the time, but not the distance. Not Sufficient.

Together - We have both the distance and the time. Therefore, we can determine that Karen's average speed was 600 mph, which is less than 650 mph. However, this number represents Karen's average rate of travel. It is possible that Karen traveled over 650 mph for a portion of the trip and less than 600 mph for a portion of the trip, but on the average traveled 600 mph. Not sufficient.
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Re: While flying across the country, did Karen ever exceed 650 miles per [#permalink]
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: While flying across the country, did Karen ever exceed 650 miles per [#permalink]
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