Question
Pipe A can fill a tank in 4 hours while Pipe B can empty the same tank completely in 5 hours. If both the pipes are working simultaneously, then determine the time in which an empty tank will be completely filled.
Answer: Option C
:
C
Pipe A can fill a tank completely in 4 hours, Thereforein 1 hour, it can fill 1004=25% of the tank.
Pipe B can empty the tank in 5 hours, Therefore in 1 hour, it can empty 1005=20% of the tank.
So, when both are simultaneously working, then in 1 hour 5% of the tank will be filled.
For filling the tank completely, it will take 1005 = 20 hours.
2nd method:- (14)−(15)=120 . Thus tank will fill in 20 days.
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:
C
Pipe A can fill a tank completely in 4 hours, Thereforein 1 hour, it can fill 1004=25% of the tank.
Pipe B can empty the tank in 5 hours, Therefore in 1 hour, it can empty 1005=20% of the tank.
So, when both are simultaneously working, then in 1 hour 5% of the tank will be filled.
For filling the tank completely, it will take 1005 = 20 hours.
2nd method:- (14)−(15)=120 . Thus tank will fill in 20 days.
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