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anonymous

  • 5 years ago

The average speed of an express train is 15mi/hr faster than the average speed of a local train. It takes the local train 2 hours longer than the express train to cover 360 miles. What is the average speed of the express train?

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  1. anonymous
    • 5 years ago
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    speed = dist / time let the local train speed be x x = 360 / 2 + t x + 15 = 360 / t 360/t - 15 = 360 / 2 + t 360 - 15t / t = 360 / 2 + t (t+2) ( 360 - 15t) = 360t -15t^2 - 30t + 720 = 0 t^2 + 2t - 48 = 0 t^2 + 8t -6t -48=0 t(t+8)-6(t+8) = 0 t = 6 or -8 t = 6 x+15 = 360/6 = 60 x = 60 - 15 = 45 miles / hr

  2. anonymous
    • 5 years ago
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    the answer says 60 mi/hr acutally...

  3. anonymous
    • 5 years ago
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    45 miles / hr is the slower train the express is therefore 60 miles / hr

  4. anonymous
    • 5 years ago
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    oh icic

  5. anonymous
    • 5 years ago
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    i had this exact problem in my homework. you using the holt alg 1 book?

  6. anonymous
    • 5 years ago
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    yhea.... where do u live?

  7. anonymous
    • 5 years ago
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    california

  8. anonymous
    • 5 years ago
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    well durrrr only california uses the california standards

  9. anonymous
    • 5 years ago
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    irvine

  10. anonymous
    • 5 years ago
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    omg me too o.O

  11. anonymous
    • 5 years ago
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    slms?

  12. anonymous
    • 5 years ago
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    lisa?

  13. anonymous
    • 5 years ago
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    :O

  14. anonymous
    • 5 years ago
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    hi :D

  15. anonymous
    • 5 years ago
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    LOL hi

  16. anonymous
    • 5 years ago
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    LOL WHO ARE YOUUUUU

  17. anonymous
    • 5 years ago
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    anthony.... lol, who else did you give this website to?

  18. anonymous
    • 5 years ago
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    AHAHAHAHAHAHHAHA

  19. anonymous
    • 5 years ago
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    HI ANTHONY XDDDDD LOLOLOLOL

  20. anonymous
    • 5 years ago
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    HI LISA xD mr. orchestra?

  21. anonymous
    • 5 years ago
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    no i thought it was you, but ur username is like non anthony ish xD you can tell, mine is lisa ish :D

  22. anonymous
    • 5 years ago
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    yeah... i thought it was you when i read the problem lol i use that username for most websites

  23. anonymous
    • 5 years ago
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    dude i dont get ANY of the math hw TT.TT so as you can see, im posting like everysinge one haha

  24. anonymous
    • 5 years ago
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    o icic xD

  25. anonymous
    • 5 years ago
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    yeah... i noticed i'm not doing my math hw until sunday lol

  26. anonymous
    • 5 years ago
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    well i gtg now cya on monday xD LOL u made my night hahahaha

  27. anonymous
    • 5 years ago
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    hahahaha i wonder what the other person that replied to this post will think XD

  28. anonymous
    • 5 years ago
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    XD

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