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manhattan rate problem

Expert replies
by resilient » Tue Mar 04, 2008 4:23 pm
The normal speed of a train is v kilometers per hour, and it takes 24 hours to cover a certain distance. Becaue of th etrack repair, the train was not moving for the first w hours of the trip. Given that the train mantains constant speed when it moves, what was its speed in Kilometers per hour, during the time when the train was moving, if the train completed the route in 24 hours with an average speed of v kilometers per hour.

a. 12v
b24v
c.24v/w
d.24v/24-w
e.24v/24vw-w


qa is d

stumped
Appetite for 700 and I scraped my plate!
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Source: — Problem Solving |

by xilef » Wed Mar 05, 2008 4:11 pm
Not sure why the first sentence is there, it doesn't provide any useful info.

average speed = distance / time

route distance = 24v

time while moving = 24-w

v while moving = 24v / 24-w
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manhattan review

by resilient » Thu Mar 06, 2008 8:06 pm
I noticed this in the book. THe gmat will never give you information that you wont use. THe manhattan review book does this once in a while.
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