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GMAT Prep2?? (Average Speed)

Expert replies
by dferm » Wed May 14, 2008 8:43 pm
Jane walked for 4 miles. What was her average speed for the first 2 miles?

(1) Jane's average speed for the 4 miles was 3.2 miles per hour.
(2) It took Jane 15 minutes longer to walk the second 2 miles than it took her to walk the first 2 miles.

Please Help..

Thanks...
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Source: — Data Sufficiency |

by Alejandro » Sun May 18, 2008 3:00 pm
Hi well the first statement tells ou you hav the speed and the miles,ok, the second statement gives you a time.

With the second statement you can makes this
3.2 m in 1 hour
4 m--------- x
so you could have a time T(total time)

then you know that you have 2 periods of 2 miles

so time in the first 2 miles+ (the other time+15)=total time

you have total time so you are able to know the other times

with this times you are able to know the velocity in each part, so answer is c
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