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72(3) who reaches the ground first

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Source: — Data Sufficiency |
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by DREAM GMAT » Sun Oct 11, 2009 5:12 am
I think its E...

Am I Correct... If yes i can explain....but if it is NOT ...than I too need a explanation...

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MANDEEP
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by nithi_mystics » Sun Oct 11, 2009 8:03 am
I would say C.

1) B is 1m/s faster than A.
A speed's might be 100m/s or 1m/s ==> first case, A would reach first and second case B would reach first. So not sufficient.

2) A's speed is at least 3m/s.
B's speed is not given. So insufficient.

Taking both together, we can say A always reaches first.

For eg - A's speed = 3. then B's speed = 4
A reaches in 33.3 sec and B reaches in 35 secs (25+10)

Whenever n is greater than 2,
100/n < ((100/(n+1))+10)

Hope I am clear.
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Nithi
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