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 1,050 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) 30.2 C) 35.3 D) 40.2 E) 41.4
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)=1050   r=41.4   Answer:41.4
<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 1,050 miles and spent 21 hours driving during the 2 days, what was his average speed on the first day, in miles per hour?