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distance/rate - DS 69 from OG Quantitative

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distance/rate - DS 69 from OG Quantitative

by maria » Thu May 29, 2008 6:26 pm
how long did it take Betty to drive nonstop on a trip from her home to Denver, Colorado?
1, If Betty's average speed for the trip had been 1 1/2 times as fast, the trip would have taken 2 hours.
2. Betty's average speed for the trip was 50 miles per hour.

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Source: — Data Sufficiency |
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by amitansu » Thu May 29, 2008 10:44 pm
Ans A here.

From 1: vt=1.5v*2 (here v =avg.speed; t=time and distance=speed*time)

=>t=2*1.5 so sufficient

From 2: only avg. speed is given, so insufficient
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