Question
Pipe ‘A’ can fill a tank in 20 hours whereas leak
‘A’ can empty it in 30 hours. If they both operate along with pipe ‘B’, then the given tank gets filled in 15 hours. How much time is needed to fill the given tank if pipe ‘B’ and leak ‘A’ work together?Solution
Let the capacity of the tank be 60 litres {LCM (20 and 30)} Efficiency of pipe ‘A’ = 60 ÷ 20 = 3 litres/hour Efficiency of leak ‘A’ = 60 ÷ 30 = 2 litres/hour Combined efficiency of pipe ‘A’ and leak ‘A’ = 3 – 2 = 1 litre/hour Combined efficiency of pipe ‘A’, ‘B’ and leak ‘A’ = 60 ÷ 15 = 4 units/hour Efficiency of pipe ‘B’ = 4 – 1 = 3 units/hour Time taken by pipe ‘B’ and leak ‘A’ to fill the tank = 60 ÷ (3 – 2) = 60 hours
Which of the following numbers does not fit into the pattern of the series?
8, 27, 64, 100, 125, 216, 343
Which number will replace the question mark (?) in the following number series?
5, 4, 6, 15, 56, ?
A @ B means ‘A is the husband of B’
A & B means ‘A is the mother of B’
A # B means ‘A is the daughter of B’
If Q ...
With reference to the PM CARES Fund, consider the following statements:
I. The amount collected by it directly goes to the Consolidated Fund of I...
Select the correct mirror image of the given figure when the mirror MN is placed to the right side of the figure.
Select the option that is related to the fifth word in the same way as the fourth word is related to the third word and the second word is related to th...
Select the figure from the options that when placed in the blank space of the given figure will complete the pattern.
Statements:
All holders are hangers.
All hangers are hammers.
Some hammers are axes.
Conclusions:
I. Some axes ar...
Statement:
A. All germanium is lithium.
B. Some deuteron are plumbum.
C. Some germanium is chlorine.
Conclusion:
(I) ...
There are some nectar filled flowers on a tree and some bees are hovering on it. If one bee lands on each flower, one bee will be left out. If two bees ...
