Hi All,
This question (and its answers) are full of Number Property rules and patterns that you can take advantage of. It can easily be solved by TESTing THE ANSWERS.
We're told that a driving test drove the SAME distance at 3 different speeds: 40mph, 50mph and 60mph. We're also told that the TOTAL time for these 3 tests was 37 hours. We're asked for the TOTAL distance traveled.
To start, 37 hours EXACTLY is an interesting number. Given the speeds that we have to work with (and the total of 37 hours), we're probably NOT going to be dealing with fractions, so it's likely that we're looking for a distance that is a MULTIPLE of 40, 50 and 60. Also, IF we had driven the entire 37 hours at 40 mph (which we know that we didn't), we'd have gone OVER 1200 miles. Since some of that time was spent going 50mph and 60mph, the distance is clearly much GREATER than 1200 miles.
This leaves us with just 2 possible answer choices: D and E.
Let's TEST Answer D:
IF....
Total distance = 1800 miles, then each "leg" of the trip = 600 miles.
600 miles at 40mph = 15 hours
600 miles at 50mph = 12 hours
600 miles at 60mph = 10 hours
Total time = 15+12+10 = 37 hours.
This is a MATCH for what we were told.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
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