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November 21, 2014

November 21, 2014

Posted by **Anonymous** on Wednesday, April 2, 2014 at 6:18pm.

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 -
**Reiny**, Wednesday, April 2, 2014 at 7:18pmafter 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 -
**Anonymous**, Wednesday, April 2, 2014 at 9:35pmThanks a lot.

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