In order to calculate this, we will let the miles Pete drove on the second day be represented by x. We then can say that the miles he drove on the first day were 1.5x. Now, we know that the total miles driven by Pete in the two days were 1,380, so we can form the equation: 1.5x + x = 1,380. We solve this for x and obtain x = 552 miles. These were the miles he drove on the second day. For the first day, we compute 1.5 * 552 = 828 miles. The answer is D.
