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anonymous

  • one year ago

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?

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  1. anonymous
    • one year ago
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    The change on horizontal distance (y) is 0

  2. anonymous
    • one year ago
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    @Ahmad-nedal thanks so much! How did you get 500?

  3. anonymous
    • one year ago
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    |dw:1435204741155:dw|

  4. anonymous
    • one year ago
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    Oops I'm sorry. It's 240 Since (35+25)*4=240 The speeds add up since they go in opposite directions

  5. anonymous
    • one year ago
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    The two boats can never be moving at a rate more than 70km/h away from one another.

  6. anonymous
    • one year ago
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    I'm afraid there are other mistakes, if the idea is clear, just forget about the final numbers

  7. anonymous
    • one year ago
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    Right, I don't quite understand [t(35+25)] this part.. i mean the logic behind it

  8. anonymous
    • one year ago
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    Ahh okay, so using Pythag we always know the distance between the two boats...

  9. anonymous
    • one year ago
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    't' being the time passed in hours. Distance^2 = 100^2 + [(35+25)t]^2

  10. anonymous
    • one year ago
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    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

  11. anonymous
    • one year ago
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    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

  12. sdfgsdfgs
    • one year ago
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    |dw:1435206276856:dw|

  13. anonymous
    • one year ago
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    Derp! YES It is 60... hah!

  14. anonymous
    • one year ago
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    Ohhh right! Now I get it! I totally forgot about the formula d=vt

  15. anonymous
    • one year ago
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    That makes sense now

  16. anonymous
    • one year ago
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    Be careful u forgot about many things Tracy ,just like me :P Good luck

  17. anonymous
    • one year ago
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    Yep! You are solving for v in this problem.

  18. anonymous
    • one year ago
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    |dw:1435206409506:dw| So in fact, we are using pythag for this black triangle right?

  19. anonymous
    • one year ago
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    Exactly!

  20. anonymous
    • one year ago
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    Hahaha thanks @Ahmad-nedal I've got an exam tomorrow morning >.<

  21. anonymous
    • one year ago
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    @gFunc Thanks so much!!! That was really really really helpful!! Appreciate it! xx

  22. anonymous
    • one year ago
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    My pleasure! Good luck on the test!

  23. anonymous
    • one year ago
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    Thanks! :D

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