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*Q1.**A tank can be filled by two pipes in 20 minutes and 30**minutes respectively. When the tank was empty the two**pipes were opened. After some time, the first pipe was**stopped and the tank was filled in 18 minutes. After how**much time of the start was the first pipe stopped**(a) 5 minutes**(b) 8 minutes**(c) 10 minutes**(d) 12 minutes*

*Q2.**A pipe can fill a tank in ‘x’ hours and another pipe can**empty it in ‘y’ (y>x) hours. If both the pipes are open. In**how many hours will the tank be filled ?**(a) (x-y) Hours**(b) (y-x) Hours**(c) xy/(x-y) Hours**(d) xy/ (y-x) Hours*

*Q3.**12 pumps working 6 hours a day can empty a completely**filled reservoir in 15 days. How many such pumps**working 9 hours a day will empty the same reservoir in**12 days?**(a) 15**(b) 9**(c) 10**(d) 12*

*Q4.**A tap takes 36 hours extra to fill a tank due to a leakage**equivalent to half of its inflow. The inflow can fill the**tank in how many hours?**(a) 36 hrs**(b) 24 hrs**(c) 30 hrs**(d) 18 hrs*

*Q5.**A tank can be filled with water by two pipes, A and B**together in 36 minutes. If the pipe B was stopped after**30 minutes, the tank is filled in 40 minutes. The pipe B**can alone fill the tank in**(a) 45 minutes**(b) 60 minutes**(c) 75 minutes**(d) 90 minutes*

*Q6.**Two pipes A and B can fill a water tank in 20 and 24**minutes respectively and a third pipe C can empty at the**rate of 3 gallons per minute. If A, B and C are opened**together to fill the tank in 15 minutes, find the capacity**of tank?**(a) 180**(b) 150**(c) 120**(d) 60*

*Q7.**Three pipes P, Q and R can separately -fill a cistern in 4, 8**and 12 hours respectively, Another pipe S can empty the**completely filled cistern in 10 hours. Which of the**following arrangements will fill the empty cistern in less**time than others?**(a) Q alone is open**(b) P, R and S are open**(c) P and S are open**(d) P, Q and S are open*

*Q8.**A tank has a leak which would empty the completely**filled tank in 10 hours. If the tank is full of water and a**tap is opened which admits 4 litres of water per minute**in the tank, the leak takes 15 hours to empty the tank.**How many liters of water does the tank hold ?**(a) 2400 L**(b) 4500 L**(c) 1200 L**(d) 7200 L*

*Q9.**An empty tank can be filled by pipe A in 4 hours and by**pipe B in 6 hours. If the two pipes are opened for 1 hour**each alternately with first opening pipe A, then the tank**will be filled in**(a) 1 3/4hours**(b) 2 3/5hours**(c) 4 2/3 hours**(d) 5 1/2 hours*

*Q10.**A boy and girl together fill a cistern with water. The boy**pours 4 liters of water every 3 minutes and the girl pours**3 liters of water every 4 minutes. How much time will it**take fill 100 litres of water in the cistern**(a) 36 minutes**(b) 42 minutes**(c)48 minutes**(d) 44 minutes*