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Train A leaves Westtown and travels at 50 mph toward Smithville, 330 miles away. At the same time, Train B leaves Smithville and travels at 60 mph toward Westtown.

Suppose that the number of bugs in a rain-forest is growing exponentially.  If there were 2880 bugs after 3 weeks and 5120 bugs after 5 weeks, how many bugs were there initially? 

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