Question

1. Water is pouring into a cuboidal reservoir at the rate of 120 litres per minute. If the volume of reservoir is 216 m3, find the number of hours it will take to fill the reservoir. 1. 50 hours 2. 45 hours 3. 60 hours 4. 70 hours

Answer 1

Rate of flow of water = 60 litres/minute

Volume of the tank = 108 m3

1 m3 = 1000 litres

108 m3= 108000 litres

Time taken to fill the complete tank = 108000/60 = 1800 minutes = 1800/60 hours = 30 hours

The tank will be filled completely in 30 hours.

Answer 2

Volume of the reservoir

=108m3

=108×1000 litres

=108000 litres

Since water is pourind into reservoir @ 60 litres per minute.

∴ Time taken to fill the reservoir

= 60×60

108000 hours=30hours.