Volume of cuboidal reservoir = 108 m3 = (108 × 1000) L = 108000 L It is given that water is being poured at the rate of 60 L per minute. That is, (60 × 60) L = 3600 L per hour
Required number of hours = 108000/3600
= 30 hours
Thus, it will take 30 hours to fill the reservoir.