2 taps A and B can fill a tank in 20 hrs and 30 hrs respectively.Both were opened together and just when the tank should have been full it was noticed that an emptying pipe was also open. The emptying pipe was then closed and it took 6 hrs more to fill the tank. In how much time emptying pipe empties the full tank. Answer with solution
2 taps A and B can fill a tank in 20 hrs and 30 hrs respectively.Both were opened together and just when the tank should have been full it was noticed that an emptying pipe was also open. The emptying pipe was then closed and it took 6 hrs more to fill the tank. In how much time emptying pipe empties the full tank. Answer with solution
20*30/(20+30)=12
Two pipes should have filled it in 12 hours.
but after 12 hours, it took 6 more hours ( half of the time in which the two pipes should have filled the tank)
=> the emptying pipe should have emptied half the tank in 12 hours.
=> the emptying tank will empty the full tank in 24 hours
let total capacity of tank be 60 units(lcm of 20,30) efficiency of A and B be 3unit/hr and 2unit/hr respectively normally,(without any emptying pipe)time taken by both of them together to fill the tank =60/2+3=12 hrs let emptying rate of 3rd tap be x unit/hr then ,work done by three pipes together in 12hrs = total capacity of tank - work done by A and B together for last 6hrs 12*(3+2-x)=60-6*(3+2) from here x=2.5 unit /hr then time taken by emptying pipe to empty the full tank=60/2.5=24hrs
20*30/(20+30)=12Two pipes should have filled it in 12 hours.but after 12 hours, it took 6 more hours ( half of the time in which the two pipes should have filled the tank)=> the emptying pipe should have emptied half the tank in 12 hours.=> the emptying tank will empty the full tank in 24 hours
the emptying pipe should have emptied half the tank in 12 hours.
2 taps A and B can fill a tank in 20 hrs and 30 hrs respectively.Both were opened together and just when the tank should have been full it was noticed that an emptying pipe was also open. The emptying pipe was then closed and it took 6 hrs more to fill the tank. In how much time emptying pipe empties the full tank. Answer with solution
1.)In each of the following questions a number series is given. After the series, below it, a number is given followed by (a), (b), (c), (d) and (e). You have to complete the series starting with the given number following the sequence for the given series. Then answer the questions given below it.18 22 38 74121 (a) (b) (c) (d) (e) Which of the following numbers will come in place of c?2.)If the lengths of the chords intercepted by the circle + 2gx + 2fy = 0 from the coordinates axes be 10 and 24 respectively, then the radius of the circle is?3)Out of 3n consecutive integers, three are selected at random. Find the chance that their sum is divisible by 3.?
1.)In each of the following questions a number series is given. After the series, below it, a number is given followed by (a), (b), (c), (d) and (e). You have to complete the series starting with the given number following the sequence for the given series. Then answer the questions given below it.18 22 38 74121 (a) (b) (c) (d) (e) Which of the following numbers will come in place of c?2.)If the lengths of the chords intercepted by the circle + 2gx + 2fy = 0 from the coordinates axes be 10 and 24 respectively, then the radius of the circle is?3)Out of 3n consecutive integers, three are selected at random. Find the chance that their sum is divisible by 3.?
Let N be a 4 digit number in base 5. A converts it into decimal and finds that it is divisible by 7. M on the other hand assumes it to be a decimal number and observes that it is also divisible by 7. How many such N exist?
@rkshtsurana : f(x) and g(x) are two quadratic functions such that f(3) = 0 , g(5) = 0 . If they have a common root and f(5) * g(7) = 12, what is the value of common root?1) 42) 83) either 4 or 84) NOTCan you explain ?
not...equations can be multiplied with k..so their ratio is 4 or 8
Two poles of height 2 meters and 3 meters, are 5 meters apart. The height of the point of intersection of the lines joining the top of each poles to the foot of the opposite pole is,
@gnehagarg : A man is known to speak truth 3 out of 4 times. He throws a die and reports that it is a six. Find the probability that it is actually a six.a) 3/4b) 3/8c) 1/2d) 2/3
how di ?