Height and Distance - General Questions Questions and Answers Discussion Page.

1.	Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships are 30Â° and 45Â° respectively. If the lighthouse is 100 m high, the distance between the two ships is?
	A.	173 m
	B.	200 m
	C.	273 m
	D.	300 m

Answer: Option C

Explanation:

Let AB be the lighthouse and C and D be the positions of the ships.

Then, AB = 100 m, ACB = 30° and ADB = 45°.

AB	= tan 30° =	1	AC = AB x 3 = 1003 m.
AC		3

AB	= tan 45° = 1 AD = AB = 100 m.
AD

Tutorial Link:

Published by:Michael Daani

PakMCQs.net

Computer Science Civil Engineering

Networking Electronics Database

Model Papers FPSC Papers