Question

Manhole please support angle of depression of 30 degree which is approaching the shore to the point immediately penalty of server with a uniform speed 6 minutes later the angle of depression of the boat is found to be 60 degree find the time taken by the boat to reach the shore

Answer 1

According to question, the man is standing at some height and just below him the shore is situated.

From that height he she sees a boat with an angle of elevation of 30° which increases after 6 minutes (comes nearer).

Since for Trignometery we need "distance" hence d = vt.

• Let the height of tower be h.

• tan30° = 1/√3 and tan60° = √3.

• We have obtained a right ∆, so use Trignometeric Identities.

Solution is given in attachment