Pipe A can fill a tank in 12 hours. Due to a leak at the bottom it takes 20 hours to fill the tank. In what time the leak alone can empty the full tank?
11 hours
30 hours
18 hours
23 hours
Explanation:
Let leak can empty the full tank in x hours.
=> 1/12 - 1/x = 1/20 => $\dfrac{1}{12}$ -$\dfrac{1}{20} $ =$\dfrac{1}{x}$
=>$\dfrac{5-3}{60}
=1/30
x=30 hours
So, the leak alone can empty the full tank in 30 hours.
Let leak can empty the full tank in x hours.
=> 1/12 - 1/x = 1/20 => $\dfrac{1}{12}$ -$\dfrac{1}{20} $ =$\dfrac{1}{x}$
=>$\dfrac{5-3}{60}
=1/30
x=30 hours
So, the leak alone can empty the full tank in 30 hours.