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? Answers
A) 25.0 B) 30.3 C) 35.2 D) 40.4 E) 67.6
Day 1   2t+3=21   t=9   Day 2   t+3   9+3= 
<gadget id="calculator">9+3</gadget>
<output>12</output>
12   9r+12(r+15)=1600   r=67.6   Answer:67.6
<result>E</result>
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?