To qualify for a race, Denny Hamlin needs to average 180mph driving two laps around a 3 mile long tr

Mathematics
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To qualify for a race, Denny Hamlin needs to average 180mph driving two laps around a 3 mile long track. He has some engine trouble on the first lap, and averages only 90mph during that lap. How fast does Denny need to drive on the second lap to average 180mph for both laps so he can qualify?

Jun 19th, 2015

Thank you for the opportunity to help you with your question!

Let's call  x the average speed on the second lap that Denny need to drive. We will have (90+x)/2=180

So 90+x=360 then x=270 mph

Denny need to drive with an average of 270 mph on the second lap to be qualified. 

Hope it helps. 



Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 19th, 2015

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Jun 19th, 2015
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