QUESTION 3

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bacali: Master | Next Rank: 500 Posts; Posts: 245; Joined: Thu Aug 16, 2007 12:41 pm

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: Beat The GMAT — Data Sufficiency | Wed Nov 26, 2008 9:03 pm

austin: Master | Next Rank: 500 Posts; Posts: 110; Joined: Thu Oct 23, 2008 9:12 amFollowed by: 1 member; Location: India; Thanked: 9 times

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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