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15 Jun 2008, 12:25
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How much time did it take my Ferrari Spider to travel 400km?
1) My Ferrari traveled the first 200km in 2.5hrs
2) If my car's average speed had been 20km per hour greater than it was, it would have traveled the 400km in 1 hour less than it did
1) My Ferrari traveled the first 200km in 2.5hrs
2) If my car's average speed had been 20km per hour greater than it was, it would have traveled the 400km in 1 hour less than it did
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15 Jun 2008, 14:12
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It’s B.
Solution:
1) From here, we can now only now long it took to drive 200 miles. But we don’t know anything about the car’s speed during the last 200 miles; so the total time could be anything. Insufficient.
2) Let t be the time. Then, from this statement, we can obtain the equation:
400/t + 20 = 400/(t -1)
From here, we can find t, so the statement is sufficient.
Solution:
1) From here, we can now only now long it took to drive 200 miles. But we don’t know anything about the car’s speed during the last 200 miles; so the total time could be anything. Insufficient.
2) Let t be the time. Then, from this statement, we can obtain the equation:
400/t + 20 = 400/(t -1)
From here, we can find t, so the statement is sufficient.
15 Jun 2008, 14:20
Kudos
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B
BTW Vavali, are you working for a test prep company? because your questions seem to be unique but varied in degrees of difficulty, some are really easy, and some are hard. It almost seem like you are using the board to test run the questions. It is odd that your math ability can vary so much.
BTW Vavali, are you working for a test prep company? because your questions seem to be unique but varied in degrees of difficulty, some are really easy, and some are hard. It almost seem like you are using the board to test run the questions. It is odd that your math ability can vary so much.
So, B is sufficient 
