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Math Help - help me please on my trigo assignment

  1. #1
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    Smile help me please on my trigo assignment

    Two ships leave a port at the same time.The first ship sails on a bearing of 40 degrees at 18 knots(nautical miles per hour) and the second at a bearing of 130 degrees at 26 knots. How far apart are they after 1.5 hr?
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by john edgar View Post
    Two ships leave a port at the same time.The first ship sails on a bearing of 40 degrees at 18 knots(nautical miles per hour) and the second at a bearing of 130 degrees at 26 knots. How far apart are they after 1.5 hr?
    Goodness, I hope I remember how a compass works

    See the attached image for clarification.

    Now let's first explain the basics. It does not matter that the speed is knots, as long as both speeds are using the same measurement. Both are in knots so it is fine. The leave the same port at the same time, so both their courses can be plotted from a single point.

    Ship 1: 18 nautical miles per hour times 1.5 hours = 27 nautical miles
    Ship 2: 26 nautical miles per hour times 1.5 hours = 39 nautical miles.

    The angle between the ships -> 130 - 40 = 90 degrees
    This makes it considerably easy since we can simply use Pythagoras on this.

    So the light-blue line (Ship 1) has a "length" of 27 and the green line (Ship 2) has a "length" of 39.

    Using Pythagoras:

    Dist^2 = Ship1^2 + Ship2^2
    Dist^2 = 27^2 + 39^2 = 2250
    Thus Dist = 47.4342 nautical miles.
    Attached Thumbnails Attached Thumbnails help me please on my trigo assignment-trig.jpg  
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  3. #3
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    thank you so much

    Thank you sir your a big help for me. I hope you can help me with my future assignments it's nice to have someone who can help.I really appreciate it.
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