document.write( "Question 212372: Joe drove 210km at 70km/h and then another 210 km at 105km/h. It took Bill the same length of time to drive the entire 420km at constant speed. What was Bill's speed? \n" ); document.write( "
Algebra.Com's Answer #160623 by HyperBrain(694)\"\" \"About 
You can put this solution on YOUR website!
time=distance/speed.
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\n" ); document.write( "So, the total time it took for Joe to drive is:
\n" ); document.write( "\"t=%28210%2F70%29%2B%28210%2F105%29=3%2B2=5\"hr
\n" ); document.write( "---
\n" ); document.write( "speed=distance/time
\n" ); document.write( "=-=
\n" ); document.write( "So, Bill's speed is:
\n" ); document.write( "\"v=420%2F5=84\"km/hr
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