61). Two pipes A and B can fill a tank in 24 and 32 min, respectively. If both the pipes are opened together, after how much time pipe B should be closed so that the tank is full in 9 min?
A). 40 min |
B). 30 min |
C). 10 min |
D). 20 min |
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62). Two pipes A and B can fill a cistern in 15 and 20 min, respectively. Both the pipes are opened together, but after 2 min, pipe A is turned off. What is the total time required to fill the tank?
A). \( \Large \frac{46}{3} \) min |
B). \( \Large \frac{52}{3} \) min |
C). \( \Large \frac{43}{3} \) min |
D). \( \Large \frac{41}{3} \) min |
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63). A tank can be filled by a tap in 20 min and by another tap in 60 min. Both the tape are kept open for 5 min and then the 1st tap is shut off. After this. how much time the tank will be completely filled?
A). 20 min |
B). 30 min |
C). 45 min |
D). 40 min |
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64). If two pipes function together, the tank will be filled in 12 h. One pipe fills the tank in 10 h faster than the other. How many hours does the faster pipe take to fill up the tank?
A). 20 h |
B). 60 h |
C). 15 h |
D). 25 h |
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65). A pipe P can fill a tank in 12 min and another pipe R can fill it in 15 min. But, the 3rd pipe M can empty it in 6 min. The 1st two pipes P and R are kept open for double the 2.5 min in the beginning and then the 3rd pipe is also opened. In what time is the tank emptied?
A). 30 min |
B). 25 min |
C). 45 min |
D). 35 min |
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66). There are 7 pipes attached with a tank out of which some are inlets and some are outlets. Every inlet can fill the tank in 10 h and every outlet can empty the tank in 15 h. When all the pipes are opened simultaneously, the tank is filled up in \( \Large \Large 2\frac{8}{11} \) h. Find the numbers of inlets and outlets.
A). 5 |
B). 6.1 |
C). 4.3 |
D). 3.4 |
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67). Capacity of tap B is 80% more than that of A. If both the taps are opened simultaneously, they take 45 h to fill the tank. How long will B take to fill the tank alone?
A). 72 h |
B). 48 h |
C). 66 h |
D). 70 h |
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68). Three taps A, B and C fill a tank in 20 min, 15 min and 12 min, respectively. If all the taps are opened simultaneously, how long will they take to fill 40% of the tank?
A). 1 min |
B). 2 min |
C). 3 min |
D). 4 min |
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69). Taps A, B and C are attached with a tank and velocity of water coming through them are 42 L/h, 56 L/h and 48 L/h, respectively. A and B are inlets and C is outlet. If all the taps are opened simultaneously, tank is filled in 16 h. What is the capacity of the tank?
A). 2346 L |
B). 1600 L |
C). 800 L |
D). 960 L |
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70). Two taps A and B can fill a tank in 25 min and 20 min, respectively. But taps are not opened properly, so the taps A and B allow \( \Large \Large \frac{5}{6} \)th and \( \Large \Large \frac{2}{3} \)rd part of water respectively. How long will they take to fill the tank?
A). 12 min |
B). 13 min |
C). 14 mm |
D). 15 min |
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