| 1. | A cistern is provided with two pipes A and B. A can fill it in 20 minutes and B can empty it in 30 minutes. If A and B be kept open alternately for one minute each, how soon will the cistern be filled ? | |
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121 minutes
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110 minutes
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115 minutes
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120 minutes
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Report Question| 2. | Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes, C is also opened. The tank is filled up in ? | |
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39 minutes
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46 minutes
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40 minutes
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45 minutes
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| 3. | Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full ? | |
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4 and 1/2
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3 and 1/2
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3 and 1/4
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4 and 2/3
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| 4. | A Boy and girl together fill a cistern with water. The boy pours 4 litres of water every 3 minutes and the girl pours 3 litres every 4 minutes. How much time will it take to fill 100 litres of water in the cistern ? | |
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36 minutes
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42 minutes
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48 minutes
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44 minutes
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| 5. | A tap can empty a tank in 30 minutes. A second tap can empty it in 45 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank ? | |
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30 minutes
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18 minutes
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14 minutes
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15 minutes
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| 6. | Pipe A can fill a cistern in 6 hours and pipe B can fill it in 8 hours. Both the pipes are opened simultaneously, but after two hours, pipe A is closed. How many hours will B take to fill the remaining part of the cistern ? | |
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2 hrs
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3 and 1/3 hrs
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2 and 2/3 hrs
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4 hrs
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| 7. | A tap can fill an empty tank in 12 hours and another tap can empty half the tank in 10 hours. It both the taps are opened simultaneously, how long would it take for the empty tank to be filled to half its capacity ? | |
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30 hours
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20 hours
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15 hours
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12 hours
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| 8. | A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed, how long will it take for the tank to be full ? | |
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20 minutes
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45 minutes
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25 minutes
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30 minutes
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| 9. | 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 in10 hours. Which of the following arrangements will fill the empty cistern in less time than others ? | |
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Q alone is open
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P and S are open
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P, R and S are open
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P, Q and S are open
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| 10. | A pump can fill a tank with water in 2 hours. Because of a leak in the tank it was taking 2 and 1/3 hours to fill the tank. The leak can drain all the water off the tank in ? | |
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8 hours
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7 hours
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14 hours
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4 and 1/3 hours
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