DRDO Multi tasking staff Model paper 6

A pipe can fill the tank in = 10 hours
∴ In 1 hour pipe can fill = 1/10
Tank is actually filled in = 12 hours
∴ In 1 hour tank actually fills = 1/12
∴ In 1 hour the leak empties,
⇒

1

10

−

1

12

⇒6−

5

60

⇒ 1/60
∴ The leak can empty the whole tank in = 60 hours