Task: Question Answering
Input (English): Question: A truck driver drove for 2 days. On the second day, he drove 3 hours longer and at an average speed of 15 miles per hour faster than he drove on the first day. If he drove a total of 1,600 miles and spent 21 hours driving during the 2 days, what was his average speed on the first day, in miles per hour?

 Option A: 25.0

 Option B: 30.3

 Option C: 35.2

 Option D: 40.4

 Option E: 67.6
Output (English): Option E