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In an endurance race, a car drove the whole race at a

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In an endurance race, a car drove the whole race at a

by BTGmoderatorDC » Mon May 27, 2019 4:15 am

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In an endurance race, a car drove the whole race at a constant speed of 3 miles per minute to cover the total race distance D. Was the value of D greater than 500 miles?

Statement 1. The time taken by the car to cover D was more than 2 hours.
Statement 2. The time taken by the car to cover D was less than 2.75 hours.

OA B

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Source: — Data Sufficiency |

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by Ian Stewart » Mon May 27, 2019 6:38 am

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The car is driving 180 miles per hour. If it drove more than 2 hours, all we know is that it drove more than 360 miles, so Statement 1 is not sufficient. If it drove less than 2.75 = 11/4 hours, then it drove less than (11/4)(180) = (11/2)(90) = 11*45 = 495 miles, so the total distance was certainly less than 500 miles and Statement 2 is sufficient alone. The answer is B.
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