CAT 1994 — QA Question 15

Since a bucket holds 5 litres of water, water discharged in one minute by tap A, B and C is $\frac{5}{6}$ litres, $\frac{2}{3}$ litres and $\frac{1}{2}$ litres respectively.

If A, B and C are all opened simultaneously, total discharge in one minute = $\left(\frac{5}{6}+\frac{2}{3}+\frac{1}{2}\right)$ = 2 litres.

So in 2 hours, the discharge would be 240 litres, that is the capacity of the tank.