GMAT Question of the Day (Sep 6): Algebra and Critical Reasoning

Math (PS)

The safety distance $D$ (meters) between cars moving on a motorway depends on their speed $V$ (meters per second):
$D = \frac{V^2}{100} + 9$

If two cars want to maintain a time interval of 1 second between each other, which of the following speeds will breach the safety regulation?

(A) 5 m/s
(B) 10 m/s
(C) 25 m/s
(D) 50 m/s
(E) 90 m/s

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Verbal (CR)

Neither a rising standard of living nor balanced trade, by itself, establishes a country's ability to compete in the international marketplace. Both are required simultaneously since standards of living can rise because of growing trade deficits and trade can be balanced by means of a decline in a country's standard of living.

If the facts stated in the passage above are true, a proper test of a country's ability to be competitive is its ability to

(A) balance its trade while its standard of living rises
(B) balance its trade while its standard of living falls
(C) increase trade deficits while its standard of living rises
(D) decrease trade deficits while its standard of living falls
(E) keep its standard of living constant while trade deficits rise

Answers to the questions: A, A
For explanations please see these threads: math and verbal

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GMAT Question of the Day (Sep 6): Algebra and Critical Reasoning

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