MATH PROBLEM FROM CHINA | If a ship had 26 sheep and 10 goats onboard, how old is the ship's captain?

A passenger on a large ship sailing in a quiet sea hangs a ball from the ceiling of her cabin by means of a long thread. Whenever the ship accelerates , she notes that the pendulum ball lags behind the point of suspension and so the pendulum no longer hangs vertically. How large is the ship's acceleration when teh pendulum stands at an angle of 5^(@) to teh vertical?

From a top of a lighthouse, an observer looks at the ship and find the angle of depression to be 45^(@) . If the height of the lighthouse is 1000m , then how far is that ship from the lighthouse.

Two ships, 1 and 2, move with constant velocities 3 m/s and 4 m/s along two mutually perpendicular straight tracks toward the intersection point O. At the moment t = 0 the ships were located at the distances 120 m and 200 m from the point O. How soon will the distance between the ships become the shortest and what is it equal to ?