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Omni-MATH / A line of soldiers 1 mile long is jogging. The drill sergeant, in a car, moving…

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problem

A line of soldiers 1 mile long is jogging. The drill sergeant, in a car, moving at twice their speed, repeatedly drives from the back of the line to the front of the line and back again. When each soldier has marched 15 miles, how much mileage has been added to the car, to the nearest mile?

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