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Data Sufficiency Gmat Prep 2 PS 33

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Data Sufficiency Gmat Prep 2 PS 33

by kellyeroses » Fri Jan 11, 2008 4:23 pm
How much time did it take a certain car to travel 400 kilometers?

1. The car traveled the first 200 kilometers in 2.5 hours

2. If the car's average speed had been 20 kilometers per hour greater than it was, it would have traveled the 400 kilometers in 1 hour less time than it did.

Any help or how to approach these types of problems would be helpful.

Thanks!
Kelly
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by rchadha7 » Fri Jan 11, 2008 5:20 pm
ans is B
if speed is s and time taken is t
st = 400

also (s+20)(t-1)=400 ...ya its t-1..typo corrected

you have 2 equations solve it and we get s=80 t=5
solving will give 1 -ve and 1 +ve value.. discard the -ve.
Last edited by rchadha7 on Sat Jan 12, 2008 6:44 pm, edited 1 time in total.
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by cris » Sat Jan 12, 2008 8:26 am
Wouldnt it be: (s+20)(t-1)=400??

It says one hour LESS...
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