Question

If a man drives a car at a speed of 50 km/h
and starts the journey at 10:30 a.m., when
does he reach the place?
A water tank had three inlets, which
independently can fill the tank in 20, 40
and 30 minutes, respectively. How much
time does it take to fill the tank when all
three inlets work together?
​

Answer 1

Answer:

Step-by-step explanation:

Part emptied by the leak in 1 hr=  

6

1

​  

 

Net part emptied by the leak and the inlet pipe in 1 hr=  

8

1

​  

 

Part fill by the inlet pipe in 1 hr=  

6

1

​  

−  

8

1

​  

=  

24

1

​  

 

i.e inlet pipe fills the tank in 24 hr=24×60=1440min.

According to the question inlet pipe fills water at the rate of 4 liters per minute.

Hence, water fills in 1440 min=1440×4=5760L