Question
Time taken by ‘A’ to fill a tank, which is 40%
empty, is 20 minutes, while time taken by ‘B’ to fill the same tank, when it is 25% full, is 30 minutes. On a particular day, when the tank is completely empty, both pipes are opened together. Find the time (in minutes) after which ‘A’ must be closed so that the tank gets completely filled in 28 minutes.Solution
Time taken by ‘A’ to fill the empty tank = {20/0.4} = 50 minutes Time taken by ‘B’ to fill the empty tank = {30/0.75} = 40 minutes Let the total capacity of the tank be 200 litres Efficiency of ‘A’ = {200/50} = 4 litres/minute Efficiency of ‘B’ = {200/40} = 5 litres/minute Let the time after which ‘A’ is closed be T minutes. ATQ, (4 + 5)T + 5(28 - T) = 200 9T + 140 - 5T = 200 4T = 60 T = 15
Which statement among the following is incorrect regarding the geographical description of Uttarakhand?
Which among the Lagrange points is considered stable?
In the Union Budget 2021- 22, the government has proposed how many new modern fishing harbors?
According to Rutherford atomic model, the electrons revolve around the nucleus in ________ paths.
Where is the Headquarters of the International Atomic Energy Agency (IAEA)?
Who is the chairperson of the National Disaster Management Authority (NDMA) in India?
How many districts of India is recognised as Aspirational District?
Newton's first law of motion gives the concept of –
In the eukaryotic cell cycle, which phase is known as the 'distance phase' where chromosomes decondense and the nuclear membrane reforms?
Consider the following statements about Zero Hour in the Indian Parliament:
Statement (I): Zero Hour is an Indian parliamentary innovation.
<...
Relevant for Exams:
