1.

1). 652). 723). 454). 60

Answer»

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,

$( \Rightarrow \frac{1}{{10}} - \frac{1}{{12}})$

$( \Rightarrow \frac{{6 - 5}}{{60}})$

⇒ 1/60

∴ The leak can empty the WHOLE tank in = 60 hours



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