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Source: — Data Sufficiency |
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by Zipper » Sun Jan 25, 2009 3:12 pm
1) no info about the second half of the trip
2) Time=Distance/Speed
1.1 T=400/S
1.2 T+1=400/S-1
substitute (400/S)+1=(400/S-1) -> one unknown, hence solvable.

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