There are two temples. One of each bank of a river, just opposite to each other. One temple is 54 m high. From the top of this temple the angles of depression of the top and foot of the other temple are $30^o$and $60^o$respectively. The length of the temple is:
A prism has as the base a right angled triangle whose sides adjacent to the right angles are 10 cm and 12 cm long. The height of the prism is 20 cm. The density of the material of the prism is 6 gm/cubic cm. The weight of the prism is: