Two pipes A and B can fill a tank in 12 and 24 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?
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A pump can fill a tank with water in 2 hours. Because of a leak, it took 2$\dfrac{2}{3}$ hours to fill the tank. The leak can drain all the water of the tank in? |
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A tank is filled in 10 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank? |
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Two pipes P and Q can fill a cistern in 12 min and 16 min respectively. Simultaneously both the pipes are opened together, then after how much time Q should be closed so that tanks full in 9 min? |
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Evaluate 6! |
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Evaluate $^8P_{2}$ |
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How many words with or without meaning, can be formed by using all the letters of the word, 'DELHI' using each letter exactly once? |
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Evaluate $^8C_{2}$ |
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An urn contains 5 red and 3 blue balls.In how many different ways,2 red and 1 blue balls can be drawn? |
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2.008 = ? |
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23.004 - 16.5628 = ? |
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