Assigment in Math solid mensuration

1. Find the lateral area of the frustum of a regular square pyramid whose base edge are 6cmx12cm and whose altitude is 4cm

 

2.Find the volume of the frustum of a regular hexagonal pyramid if an edge of the lower base is 12 cm, a laterral edge is 10 cm and whose altitude is 4cm.

 

3.The reservoir is in the form of the frustum of an inverted square pyramid with upper base edge 24m, lower base edge 18m and altitude 3m. how many hours will it require for an inlet pipe to fill the reservoir if water flows in at the rate of 200 liters per min. Thanks in advance !