921. A tap can fill a tank in 32 min. and another can empty it in 16 min. Â If the tank is already half full and both the tanks are opened together, the tank will be_________??
A. 12 min
B. Â 14 min
C. Â 16 min
D. Â 20 min

922. A leak in the bottom of a tank can empty the full tank in 6 hrs. Â An inlet pipe fills water at the rate of 4 lit. a minute. Â When the tank is full, the inlet is opened and due to the leak, the tank is empty in 8 hrs. Â The capacity of the tank in liters is_________??
A. 5,750 litres
B. Â 5,760 litres
C. Â 6,890 litres
D. Â None of these

923. P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 50 days to complete the same work. then Q alone can do it in__________??
A. 30 days
B. Â 25 days
C. Â 20 days
D. Â 15 days

924. 10 men can complete a work in 7 days. But 10 women need 14 days to complete the same work. How many days will 5 men and 10 women need to complete the work??
A. 7
B. Â 5
C. Â 6
D. Â 4

925. P and Q need 8 days to complete a work. Q and R need 12 days to complete the same work. But P, Q and R together can finish it in 6 days. How many days will be needed if P and R together do it??
A. 7
B. Â 8
C. Â 9
D. Â 10

926. Running at the same constant rate, 6 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes??
A. 2700
B. Â 1080
C. Â 450
D. Â 1800

927. A alone can finish a work in X days. B alone can finish the same work in X+5 days. Together, they take 6 days to complete the work. Find X?
A. 12
B. Â 8
C. Â 10
D. Â 9

928. A can do (1/3) of a work in 5 days and B can do (2/5) of the work in 10 days. In how many days both A and B together can do the work ??
A. 75/8 days
B. Â 44/6 days
C. Â 48/5 days
D. Â None of these

929. A leak in the lower portion of a tank can empty the full tank in 9 hrs. Â An inlet pipe fills water at the rtae of 10 lit. a minute. Â When the tank is full, the inlet is opened and due to leak, the tank is empty in 16 hrs. Â How many litres does the cistern hold ??
A. 12,342 litres.
B. Â 12,444 litres
C. Â 12,566 litres.
D. Â None of these

930. A,B,C, can do a work in 8,14,16 days respectively. A does the work for the first 2 days. B continues from it and finishes 2/3rd of the remaining work. C finishes the remaining work. How many days would have taken to complete the work??
A. 13
B. Â 11
C. Â 12
D. Â 15

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