anonymous
  • anonymous
HELPP!! Two airplanes leave an airport at the same time. the first airplane flies east at 635mph. the second airplane flies west at 615mph. how long will it take for the airplanes to be 1,000 miles apart?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Answer = 0.8 hours = 48 minutes Relative Speed of Fast plane = 635 mph + 615 mph = 1250 mph Time to 1000 miles = 1000 miles / 1250 miles per hour = 0.8 hours Speed in opposite direction = v1 + v2 Speed in Same direction = v1-v2 v1 = speed of fast object v2 = speed of slower object
anonymous
  • anonymous
so 48 minutes?
anonymous
  • anonymous
yup :)

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anonymous
  • anonymous
8 hrs?
anonymous
  • anonymous
its bout flieing so how can it be 48 minutes? :/
anonymous
  • anonymous
its impossible
anonymous
  • anonymous
start with the basics : speed = distance/time
anonymous
  • anonymous
i did
Jhannybean
  • Jhannybean
Draw yourself a diagram.
anonymous
  • anonymous
would agree with @Jhannybean
anonymous
  • anonymous
kk
anonymous
  • anonymous
thats what i got :b
Jhannybean
  • Jhannybean
@Rachel_K Would you please stop giving answers? It's against the code of conduct here on OS.
anonymous
  • anonymous
i didn't i explained in the beginning im just confirming what i got
anonymous
  • anonymous
.
anonymous
  • anonymous
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mathstudent55
  • mathstudent55
@Rachel_K You answered correctly above 0.8 hours = 48 minutes. Later you wrote 8 hours and 48 minutes.
anonymous
  • anonymous
ok then so i was right
mathstudent55
  • mathstudent55
Yes, you were, and your explanation above about adding speeds was good. If one plane alone traveling at 635 mph would cover 1000 miles in little more than an hour, then it makes sense that two planes traveling in opposite directions both at 600 something mph would be 1000 miles part from each other in under an hour.
anonymous
  • anonymous
As @Rachael said total speed = 635mph+ 615mph = 1250mph however, to fly 1,000 miles = 1000m/1250mph = 0.8 hours
anonymous
  • anonymous
I think we should give it to @Rachel_K here. I am giving it as best response.

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