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a pipe working at full speed can fill an empty tank in 2 hours. however, during the first hour it served one-twelfth of its capacity, during the second hour it served one-ninth of its capacity, during the third hour it served one-sixth of its capacity, during the fourth hour it worked at one-fourth of its capacity and during the fifth hour it worked at only one-third of the capacity at which it was supposed to operate. was efficient. the second pipe also did the same thing, but if it worked at its full speed, it had to fill the empty tank in 4 hours. if both these pipes and the pipe which empties the tank at a constant speed are turned on simultaneously, then half empty tank can be filled in 5 hours. if a single emptying pipe is run, how many hours will it take to empty the filled tank? (a) 30 (b) 32 (c) 20 (d) 24

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(3^(11)+3^(12)+3^(13)+3^(14)...) is divisible by a.7 b.8 c.11 d.14

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Rohit wants to earn 21% profit on a belt after offering 45% discount . By how much percentage more should he mark the price of his article above the cost price

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for what value of k will the equation x^2-(a+k)x+k^2-9/4=0 have real and distinct roots

a) k<3
b) k<3
c) |k|<3
d) |k|<_3

Amu spends 90% of her income. If her expenditure increases by 25% and savings increase by 30%, then by what percent does her salary increase?