The volume of a tank is 72 cubic metres. Water is poured into it at the rate of 60 litres per minute. How much time will it take to fill the tank?

20 hours

1\( {m }^{3 } \) = 1000 litres,

⇒ Therefore, total volume of the tank =  72\( {m }^{3 } \) = 72000 litres,

⇒ Total time taken to fill the tank = \(\frac{72000}{60}\) = 1200 minutes,  ..(\(\frac{Total volume}{Rate of water poured in minute}\) = Total Time taken)

⇒ \(\frac{1200}{60}\) = 20 hours,