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QUESTION 3

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QUESTION 3

by bacali » Wed Nov 26, 2008 9:03 pm
Is the number of seconds required to travel d1 feet at r1 feet per second greater than the number of seconds required to travel d2 feet at r2 feet per second?

(1) d1 is 30 greater than d2.
(2) r1 is 30 greater than r2.

OA: E
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Source: — Data Sufficiency |
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by austin » Wed Nov 26, 2008 9:31 pm
time = distance /speed

Stem translation: Is d1/r1 > d2/r2?

(1) d1 is 30 greater than d2 No info about r1,r2

(2) r1 is 30 greater than r2. No info about d1,d2

Combining, is (d2+30)/(r2+30) > d2/r2?

d2 = r2 = 1; 31/31 > 1/1? NO

d2 = 50, r2 = 1; 80/31 > 50/1? NO

d2 = 20, r2 = 50; 50/80 > 20/50? YES INCONSISTENT ANSWERS

Answer: E
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