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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*