A vertical stick which is 27cm long casts a 18cm long shadow on the ground. At the same time, a vertical tower casts a 70m long shadow on the ground. Find the height of the tower.
A straight highway leads to the foot of the tower. A man standing at the top of the tower observes a car at an angle of depression of 30∘, which is approaching the foot of the tower with a uniform speed. 9minutes later, the angle of depression of the car is found to be 60∘. What is the time taken by the car after 9minutes to reach the foot of the tower?
Andre made a bird-bath for his garden in the shape of a cylinder with a hemispherical depression at one end. If the height of the cylinder is 126 cm and its radius is 63 cm. Choose the correct total surface area of the bird-bath. (Take π = 22/7)
Ali and Rafa sit on the 8-member board of directors for company P. If the board is to be split up into two 4-person subcommittees, what is the percentage that Rafa and Ali are included in the same sub-committee?