Saturday

April 19, 2014

April 19, 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!

**Related Questions**

maths - a person observed from the top of a light house which is 80 m above the ...

maths - from a point on the ground the angle of elevation of the bottom and top ...

Trig - a sailor out in a lake sees two likght houses 11km apart along the shore ...

math - a light house has an angle of depression from the top of 34 degrees and ...

Pre Calc - from the top of a 250 ft lighthouse the angle of depression to a ship...

calculus - A light house is 1 km off shore. A marathoner is running along the ...

trig - The angle of elevation from the top of a house to a jet flying 2 miles ...

math - the Angle of Elevation From a Ship to the Top of a Lighthouse on the ...

physics - A lighthouse standing on the top of a cliff is observed from two open ...

science- help needed. - each statement is false. rewrite each one as a true ...