trig

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Ships A and B leave port at the same time and sail on straight paths making an angle of 60 degrees with each other. HOw far apart are the ships at the end of 1 hour if the speed of ship A is 25 km/h and that of ship B is 15 km/h?

  • trig -

    after 1 hours, one ship has gone 25 km, the other 15 km
    make a sketch, let the distance between them be x

    straigh-forward case of the cosine law

    x^2 = 25^2 + 15^2 - 2(25)(15)cos 60°
    = ....

    you do the arithmetic.

    (I got appr 21.8 km)

  • trig -

    Thanks a lot.

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