Pipe X can fill a tank in 60 hours while pipe Y can fill the tank in 72 hours. Both pipes are opened together for 20 hours. How much of the tank is left empty ?

Pipe X can fill a tank in 60 hours while pipe Y can fill the tank in 72 hours. Both pipes are opened together for 20 hours. How much of the tank is left empty ?
पाइप X किसी टंकी को 60 घंटे में भर सकता है, जबकि पाइप Y उसी टंकी को 72 घंटे में भर सकता है। दोनों पाइपों को एक साथ 20 घंटे तक खोला जाता है। टंकी का कितना भाग अभी भी खाली रह जाएगा?

$\frac{3}{8}$ $\frac{1}{8}$ $\frac{243}{360}$ $\frac{7}{18}$

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Pipe X can fill a tank in 60 hours while pipe Y can fill the tank in 72 hours. Both pipes are opened together for 20 hours. How much of the tank is left empty ?

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