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Bunuel
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Official Solution:


On a training run, did Jordan ever exceed a speed of 12 kilometers per hour?

(1) Jordan took less than 2 hours to complete the run.

Clearly not sufficient.

(2) Jordan covered 24 kilometers during the run.

Clearly not sufficient.

(1)+(2) If the run covered 24 km in less than 2 hours, then the average speed was above 12 km/h. To achieve an average above 12, he must have exceeded 12 at some point and for some time during the run. Sufficient.

Answer: C

Bunuel, what if jordan maintained the speed of 12kph through out 2 hours, I think it's option e, please correct me if I 'm wrong

You're missing a key detail: Statement 1 says Jordan took less than 2 hours, not exactly 2. So if he ran 24 km in less than 2 hours, his average speed was greater than 12 km/h. To have an average above 12, he must have been above 12 km/h for at least part of the time, meaning he did exceed 12.

So the correct answer is C, not E.

P.S. All PS, DS, and DI questions in the tests are correct.
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I don’t quite agree with the solution. https://gmatclub.com/gmat-focus-tests/v ... 74623.html

go with the same problem how come logic for disobey with similar one with data change?
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I don’t quite agree with the solution. https://gmatclub.com/gmat-focus-tests/v ... 74623.html

go with the same problem how come logic for disobey with similar one with data change?

The question is correct. Your doubt shows you're missing the key difference between the two cases.

In the first question, when combining the statements, we know the distance is 24 km and the time is less than 2 hours. This means the average speed was greater than 24/2 = 12 km/h. So the answer is C.

In the second question, we know the distance is 480 km and the time is more than 4 hours. This means the average speed was less than 480/4 = 120 km/h. But that doesn't tell us whether the speed ever exceeded 120 at any point, only that the overall average was below 120. So the answer is E.

Hope it's clear.
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