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dunkin77
Really wants to Beat The GMAT!
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 Posted: Fri Apr 06, 2007 6:00 pm Post subject: 500 ds test5# 20 |
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Hi,
I thought the answer was A) but actually correct answer is D)
For 2), why it is okay although we dont know the average rate for the last half?? 
. How many miles long is the route from Houghton to Callahan?
(1) It will take 1 hour less time to travel the entire route at an average rate of 55 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 11 hours to travel the first half of the route at an average rate of 25 miles per hour. |
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gabriel
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| Posted: Sat Apr 07, 2007 10:56 am Post subject: Re: 500 ds test5# 20 |
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| dunkin77 wrote: | Hi,
I thought the answer was A) but actually correct answer is D)
For 2), why it is okay although we dont know the average rate for the last half??
. How many miles long is the route from Houghton to Callahan?
(1) It will take 1 hour less time to travel the entire route at an average rate of 55 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 11 hours to travel the first half of the route at an average rate of 25 miles per hour. |
shuldnt the first half be equal to the second half  .. first half = 11*25= 275 so the second half is also equal to 275 .. so total distance 275*2= 550... |
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