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This series is designed to help you step up your Data Sufficiency practice while we all spend a little extra time at home during the coronavirus situation; I’m going to publish one practice Data Sufficiency question each day! You can choose to do all of them, or none of them. 

Click on the tag “Social Distancing DS Challenge” at the bottom of this post to see all of the questions in this series! 

And remember to take whatever precautions you need to stay healthy over the next few weeks! 

Question #23

What distance did Marty drive?

(1) Wendy drove 15 miles in 20 minutes.

(2) Marty drove at the same average speed as Wendy.

Explanation

We know that statement (1) is not sufficient because it doesn’t tell us anything about Marty.

Statement (2) by itself also fails to provide enough information, since statement (2) doesn’t tell us anything about Wendy’s distance.

But it looks like it might, combined with statement (1), give us enough information to answer the question. We know how far Marty would get in any 20 minute interval, but the problem is that we don’t know how long Marty drove. The correct answer is (E).