Two poles of heights 20metres and 40metres stand vertically on a plane ground. If the distance between their feet is 21metres, find the distance between their tops.
There is a cylindrical scale holder of height 12cm and diameter 14cm. Now the scale holder is cut into two pieces such that the height of the new scale holder is reduced to (56)th of the height. The diameter of the new scale holder remains the same. If the new scale holder is filled with water up to the brim, then find the amount of water held in liters. (Where π=3.14)