anonymous
  • anonymous
One morning, Justin drove 3 hours before stopping to eat lunch. After lunch, he increased his speed by 10 mph. If he completed a 390-mile trip in 6 hours of driving time, how fast (in miles per hour) did he drive in the morning?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Kkutie7
  • Kkutie7
before lunch justin drove xmiles/hour for 3hours. after lunch he drove x+10miles/hour for 3hours. the addition of this is 390miles/6hours my first frame of thought
Kkutie7
  • Kkutie7
\[(\frac{xmiles}{hour}*\frac{3hours}{1})+(\frac{x+10miles}{hour}*\frac{3hours}{1})=\frac{390miles}{6hours}\] again just an idea
anonymous
  • anonymous
it wasnt right but it helped me get the right answer. it would have been correct if you didnt include the 6 hours THANKS !!!

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Kkutie7
  • Kkutie7
oh right =) well at least I helped lol

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