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- Gmat Prep 1 (2nd) - Rates & Distance.doc
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Statement I tells you that Distance=72 x time
Statement II tells you that Distance= 80 x (time-1)
Both are insufficient on their own because you have two variables (D and t) and one equation.
Putting I and II together you get 72 x time = 80 x (time-1)
Now you can solve for t and consequently for D also.
Answer is C.