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September 21, 2014

September 21, 2014

Posted by **pooja** on Tuesday, November 8, 2011 at 4:14am.

- maths -
**Steve**, Tuesday, November 8, 2011 at 12:59pmLocate points on the ocean:

Let the point at 30 degrees be A

Let the point at 60 degrees be B

Let the base of the lighthouse be point C

Let the height of the lighthouse be h

h/BC = tan 60 = √3

h/AC = tan 30 = 1/√3

√3 BC = 1/√3 AC

3BC = AC

That means AC = AB + BC

SO, 3BC = AB + BC

So, AB = 2BC

AB was traveled in 10 seconds.

So, BC will take only 5 seconds to cover.

Watch out for those rocks!

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