There are 8 filling pipes each capable of filling a cistern alone in 26 minutes and 6 emptying pipes each capable of emptying a cistern alone in 24 minutes. All pipes are opened together and as a result, tank fills 27 litres of water per minute. Find the capacity of the tank.

a)445 L

b)458 L

c)460 L

**d)468 L**

e)None of these

**ANSWER: 468 L**

Firstly we have to calculate one minute work for all pipes together. The equation is :

8/26 – 6 / 24 = **3/52 ** for a minute all pipes together. Then calculate tank capacity.

if 3/52 = 27 litres then 52/52 = 27 / (3/52) = **468 L**