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Rates

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naveenhv
 Post subject: Rates
 Post Posted: Fri May 06, 2011 1:38 pm 
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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.
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vikram4689
 Post subject: Re: Rates
 Post Posted: Sat May 07, 2011 5:03 am 
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This can be done in an oral manner.
a) it is insufficient, we do not know about next half of jouney.

b) B will give you an equation

400/s - 400/(s+20) = 1
From here you can find s and s = d/t = 400/t , so you can find t , hence sufficient. DO NOT SOLVE it is DS :)
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jnelson0612
 Post subject: Re: Rates
 Post Posted: Sat May 07, 2011 4:21 pm 
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Nice work vikram!

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Jamie Nelson
ManhattanGMAT Instructor
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