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Senior | Next Rank: 100 Posts
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by coolgirl26 » Mon Apr 13, 2009 6:34 pm
I don't get it

why is 2 correct

can someone show how to solve to find the time as per statement 2
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Source: — Data Sufficiency |
Newbie | Next Rank: 10 Posts
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by skris79 » Mon Apr 13, 2009 6:58 pm
1) Statement 1 is not sufficient as we know only abt the first 200 Km
2) Time = Distance/Speed
using the second statement we get (let time be t and avg speed be x)
t = 400/ x
t-1 = 400/ (x+20)
solve this 2 equations and you get the time. So statement 2 alone is sufficient.
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