document.write( "Question 176527: A truck driver drove for 2 days. On the second day he drove for 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 1020 miles and spent 21 hours on the road driviing during the 2 days, what was his average speed on the first day, in miles per hour? \n" ); document.write( "
Algebra.Com's Answer #131629 by ankor@dixie-net.com(22740)\"\" \"About 
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A truck driver drove for 2 days. On the second day he drove for 3 hours longer
\n" ); document.write( " and at an average speed of 15 miles per hour faster than he drove on the first
\n" ); document.write( " day. If he drove a total of 1020 miles and spent 21 hours on the road driving
\n" ); document.write( " during the 2 days, what was his average speed on the first day, in miles per hour?
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\n" ); document.write( "let s = av speed on the 1st day
\n" ); document.write( "then
\n" ); document.write( "(s+15) = av speed on the 2nd day
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\n" ); document.write( "let t = drive time on the 1st day
\n" ); document.write( "then
\n" ); document.write( "(t+3) = drive time on the 2nd day
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\n" ); document.write( "find t using the total hrs
\n" ); document.write( "day1 + day 2 = 21
\n" ); document.write( "t + (t+3) = 21
\n" ); document.write( "2t = 21 - 3
\n" ); document.write( "2t = 18
\n" ); document.write( "t = 9 hrs on the 1st day and 12 hrs on the 2nd day then
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\n" ); document.write( "The total distance equation
\n" ); document.write( "9t + 12(t+15) = 1020
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\n" ); document.write( "you should be able to do this now\r
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