Daniel is on an airplane flying to a destination 825 miles away. After one hour, the pilot announces that the plane is 495 miles away from its destination airport. In another hour, the pilot announces that the plane will begin its half-hour descent for the final 165 miles.

At the start, the plane is 825 miles from its destination. After one hour, it is 495 miles away, so it travels 825 − 495 = 330 miles in an hour; its distance from the airport decreases by 330 miles per hour. Therefore, the distance after t hours is d = 825 − 330t, which is choice B.

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