anonymous
  • anonymous
At noon boat A is 100 km West of boat B. A is moving at 25 km/h South, and B is moving at 35 km/h North. At what rate is the distance between A and B changing at 4pm?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
The change on horizontal distance (y) is 0
anonymous
  • anonymous
@Ahmad-nedal thanks so much! How did you get 500?
anonymous
  • anonymous
|dw:1435204741155:dw|

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More answers

anonymous
  • anonymous
Oops I'm sorry. It's 240 Since (35+25)*4=240 The speeds add up since they go in opposite directions
anonymous
  • anonymous
The two boats can never be moving at a rate more than 70km/h away from one another.
anonymous
  • anonymous
I'm afraid there are other mistakes, if the idea is clear, just forget about the final numbers
anonymous
  • anonymous
Right, I don't quite understand [t(35+25)] this part.. i mean the logic behind it
anonymous
  • anonymous
Ahh okay, so using Pythag we always know the distance between the two boats...
anonymous
  • anonymous
't' being the time passed in hours. Distance^2 = 100^2 + [(35+25)t]^2
anonymous
  • anonymous
U want the distance in the equation, which is x in this case, Distance=time*speed=x From that you can also find z, the other distance
anonymous
  • anonymous
Ex: after an hour, the boats will be 100km apart on the x-axis, and 70km apart on the y-axis right? after 2hrs, the boats will still be 100km apart on the x-axis, but 140km apart on the y-axis
sdfgsdfgs
  • sdfgsdfgs
|dw:1435206276856:dw|
anonymous
  • anonymous
Derp! YES It is 60... hah!
anonymous
  • anonymous
Ohhh right! Now I get it! I totally forgot about the formula d=vt
anonymous
  • anonymous
That makes sense now
anonymous
  • anonymous
Be careful u forgot about many things Tracy ,just like me :P Good luck
anonymous
  • anonymous
Yep! You are solving for v in this problem.
anonymous
  • anonymous
|dw:1435206409506:dw| So in fact, we are using pythag for this black triangle right?
anonymous
  • anonymous
Exactly!
anonymous
  • anonymous
Hahaha thanks @Ahmad-nedal I've got an exam tomorrow morning >.<
anonymous
  • anonymous
@gFunc Thanks so much!!! That was really really really helpful!! Appreciate it! xx
anonymous
  • anonymous
My pleasure! Good luck on the test!
anonymous
  • anonymous
Thanks! :D

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