anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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
anonymous
  • anonymous
the answer says 60 mi/hr acutally...
anonymous
  • anonymous
45 miles / hr is the slower train the express is therefore 60 miles / hr

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anonymous
  • anonymous
oh icic
anonymous
  • anonymous
i had this exact problem in my homework. you using the holt alg 1 book?
anonymous
  • anonymous
yhea.... where do u live?
anonymous
  • anonymous
california
anonymous
  • anonymous
well durrrr only california uses the california standards
anonymous
  • anonymous
irvine
anonymous
  • anonymous
omg me too o.O
anonymous
  • anonymous
slms?
anonymous
  • anonymous
lisa?
anonymous
  • anonymous
:O
anonymous
  • anonymous
hi :D
anonymous
  • anonymous
LOL hi
anonymous
  • anonymous
LOL WHO ARE YOUUUUU
anonymous
  • anonymous
anthony.... lol, who else did you give this website to?
anonymous
  • anonymous
AHAHAHAHAHAHHAHA
anonymous
  • anonymous
HI ANTHONY XDDDDD LOLOLOLOL
anonymous
  • anonymous
HI LISA xD mr. orchestra?
anonymous
  • anonymous
no i thought it was you, but ur username is like non anthony ish xD you can tell, mine is lisa ish :D
anonymous
  • anonymous
yeah... i thought it was you when i read the problem lol i use that username for most websites
anonymous
  • anonymous
dude i dont get ANY of the math hw TT.TT so as you can see, im posting like everysinge one haha
anonymous
  • anonymous
o icic xD
anonymous
  • anonymous
yeah... i noticed i'm not doing my math hw until sunday lol
anonymous
  • anonymous
well i gtg now cya on monday xD LOL u made my night hahahaha
anonymous
  • anonymous
hahahaha i wonder what the other person that replied to this post will think XD
anonymous
  • anonymous
XD

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