A man in a boat rowing away from a light house 100 m high takes 2 minutes to change the angle of elevation of the top of the light house from 60 to 30. Find the speed of the boat in metres per minute.

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Q. (i) A moving boat is observed from the top of a 150 m high cliff moving away from the cliff. The angle of depression of the boat changes from 60° to 45° in 2 minutes. Find the speed of the boat in m/h.

(ii) A man in a boat rowing away from a light house 100 m high takes 2 minutes to change the angle of elevation of the top of the light house from 60° to 30°. Find the speed of the boat in metres per minute. (Use

\sqrt{3}

= 1.732)

Q. A man in a boat rowing away from a lighthouse 100 m high takes 2 minutes to change the angle of elevation of the top of the lighthouse from 60° to 30°. Show that the speed of the boat is

\frac{100 \sqrt{3}}{3}

metres per minute.

Q. A man rowing a boat away from a lighthouse which is 100 m high takes 2 min to change the angle of elevation of the light house from

45^{\circ}

30^{\circ}

. Find the speed of the boat.

[T a n 45^{\circ} = 1, T a n 30^{\circ} = 0.57]

A man rowing a boat away from a lighthouse which is 100 m high takes 2 min to change the angle of elevation of the light house from $45^{\circ}$ to $30^{\circ}$ . The speed of the boat is $[T a n 45^{\circ} = 1, T a n 30^{\circ} = 0.57]$

Q. A man in a boat rowed away from a cliff

50

m high It takes

2

minutes to change the elevation at the top of the cliff from

60^{\circ}

45^{\circ}

The speed of the boat is

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