Question

A motor can pump water to fill an empty tank in 35 minutes. If a quarter of the tank is full and the motor is on for about 14 minutes, then how
much of the tank is empty?

Answer 1

Answer:

Step-by-step explanation:

Let the leak be able to empty the tank in x hours.

Then, amount filled by the pump in one hour =  

3

1

​  

 

Amount emptied by the leak =  

x

1

​  

 

Amount actually filled =  

3.5

1

​  

 =  

7

2

​  

 

i.e  

3

1

​  

 -  

x

1

​  

 =  

7

2

​  

 

x

1

​  

 =  

3

1

​  

 -  

7

2

​  

 

=  

21

7

​  

 -  

21

6

​  

 =  

21

1

​  

 

Thus, x = 21 hours