OG详解-OG3 数学2 Q4

Choice C is correct. It’s given that t represents the number of seconds after the bus passes the marker. Substituting 2 for t in the given equation d = 30t yields d = 30(2), or d = 60. Therefore, the bus will be 60 feet from the marker 2 seconds after passing it.
Choice A is incorrect. This is the distance, in feet, the bus will be from the marker 1 second, not 2 seconds, after passing it. Choice B is incorrect and may result from conceptual or calculation errors. Choice D is incorrect. This is the distance, in feet, the bus will be from the marker 3 seconds, not 2 seconds, after passing it.