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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.

An engineer traveled 165 mi by car and then an additional 675 mi by plane. The rate of the plane was three times the rate of the car. The total trip took 6 h. Find the rate of the car.

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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