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Practice Questions

A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened together, after how much time will the cistern be filled ?

A. 4.5 hrs
C. 6.2 hrs
B. 5 hrs
D. 7.2 hrs
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Pipe A and B together can fill a tank in 6 hours. If B takes 5 hours more than A to fill the tank, what is the time taken by A?

A. 7
C. 12
B. 10
D. 15
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2 pipes A and B can fill a tank in 20 and 30 minutes respectively. If both pipes are used together, how long will it take to fill the tank ?

A. 15 min
C. 12 min
B. 20 min
D. 18 min
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2 pipes A and B can fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe that empties the cistern. If all 3 pipes are simultaneously opened, cistern is full in 50 minutes. In how much time can the third pipe empty the cistern ?

A. 100 min
C. 110 min
B. 90 min
D. 120 min
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Important Formulas