91). A cistern can be filled with water by a pipe in 5 hours and it can be emptied by a second pipe in 4 hours. If both the pipes are opened when the cistern is full, the time in which it will be emptied the cistern:
| A). 9 hours |
| B). 18 hours |
| C). 20 hours |
| D). \( \Large 20\frac{1}{2} \)hours |
|
92). A pipe can fill a tank with water in 3 hours. Due to a leakage in bottom, it takes hours to fill it. In what time the leak will empty the completely filled tank?
| A). 12 hours |
| B). 21 hours |
| C). \( \Large 6\frac{1}{2} \) hours |
| D). \( \Large 10\frac{1}{2} \) hours |
|
93). Two pipes A and B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 minutes. In how much time the third pipe alone can empty the cistern?
| A). 110 minutes |
| B). 100 minutes |
| C). 120 minutes |
| D). 90 minutes |
|
94). 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). 4 hrs |
| B). 4 hrs 25 min. |
| C). 3 hrs 15 min. |
| D). 3 hrs 45 min. |
|
95). One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, the slower pipe alone will be able to fill the tank in
| A). 81 minutes |
| B). 108 minutes |
| C). 144 minutes |
| D). 192 minutes |
|
96). Two pipes can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all the three pipes are kept open, then the cistern will be filled in:
| A). 5 hours |
| B). 8 hours |
| C). 10 hours |
| D). 12 hours |
|
97). Two pipes can fill a tank in 15 hours and 20 hours respectively, while the third pipes can empty it in 30 hours. If all the pipes are opened simultaneously, the empty tank will be filled in:
| A). 10 hours |
| B). 12 hours |
| C). 15 hours |
| D). \( \Large 15\frac{1}{2} \) hours |
|
98). Two pipes A and B can fill cistern in \( \Large 37\frac{1}{2} \) minutes and 45 minutes respectively. Both pipes are opened, the cistern will be filled just in half an hour, if the pipe B is turned off after?
| A). 15 minutes |
| B). 10 minutes |
| C). 5 minutes |
| D). 9 minutes |
|
99). A tap can fill a cistern in 8 hours and another tap can empty it in 16 hours. If both the taps are open, the time (in hours) taken to fill the tank will be:
| A). 8hrs |
| B). 10hrs |
| C). 16hrs |
| D). 24hrs |
|
100). A cistern-has two pipes. One can fill it with water in 8 hours and other can empty it in 5 hours. In how many hours will the cistern be emptied if both the pipes are opened together when \( \Large \frac{3}{4} \) of the cistern is already filled with water ?
| A). \( \Large 13\frac{1}{3} \) hours |
| B). 10 hours |
| C). 6 hours |
| D). \( \Large 3\frac{1}{3} \) hours |
|
