What’s the Correct Approach to Average Speed Questions? Choice C is NOT the correct answer, and this kind of trick question is a common trap for average speed problems on the GRE. It’s tempting to follow the normal logic of taking averages: add 40 + 60 to get 100, divide by 2, and get C: 50. What is his average speed for the entire trip in miles per hour? Joe drives 120 miles at 60 miles per hour, and then he drives the next 120 miles at 40 miles per hour. These questions can be tricky if you haven’t practiced solving them, because the most obvious answer choice is a trap. Average speed problems are common on the GRE.
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