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1 . Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank
A. 10 min B. 12 min
C. 14 min D. None of these

2 . 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 simultaneously, then after how much time will the cistern get filled
A. 4.2 hrs B. 5.7 hrs
C. 6.5 hrs D. 7.2 hrs

3 . A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely
A. 3 hrs 45 min B. 4 hrs
C. 4 hrs 15 min D. 5 hrs 35 min

4 . A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely
A. 4 min. to empty B. 5 min. to fill
C. 6 min. to empty D. 8 min. to empty

5 . Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled
A. 1 hr B. 2 hrs
C. 3 hrs D. 4 hrs




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