Answer :

Given,


Internal diameter of the pipe = 25 cm


Radius (r) of the pipe =


Diameter of the cylindrical tank = 12 m


Radius (R) of the tank = 6 m


Height (h) of the tank = 2.5 m


In 1 hour water comes out of the pipe = 3.6 km = 3600 m


Let the total hrs = n


Volume of the water coming out of the pipe in n hrs = volume of the cylindrical tank



= 6 × 6 × 2.5


3600 n = 36 × 2.5 × 8 × 8


100 n = 8 × 8 × 2.5


1000 n = 8 × 8 × 25


n = = 1.6 hrs


n = 1 hrs 36 minutes


Now calculate the cost;


Cost of the water = Volume of the cylindrical tank × 0.07


= = 19.80 rs


So,


Total time required to fill the tank is 1 hr 36 minutes and the cost is 19.80 rs.


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