Question
Pipe ‘A’ and pipe ‘B’ can fill a cistern in 20
minutes and 18 minutes respectively. Pipe ‘C’ alone can empty the cistern in 12 minutes. If all three pipes are opened together then what is the time taken to fill 50% of the cistern?Solution
Let the capacity of the cistern = 180 units Then, efficiency of pipe ‘A’ = 180/20 = 9 units/minute Efficiency of pipe ‘B’ = 180/18 = 10 units/minute Efficiency of pipe ‘C’ = 180/12 = 15 units/minute So, combined efficiency of pipes ‘A’, ‘B’ and ‘C’ = 9 + 10 – 15 = 4 units/minute 50% of the cistern’s capacity = 90 units Therefore, time taken by all 3 pipes together to fill 50% of the cistern = 90/4 = 22.5 minutes
D.N.A. does not contain
What is the shape of the Milky Way galaxy?
Albert Bourla, chairman and chief executive of global pharmaceutical giant _________, was awarded the prestigious Genesis Prize for his efforts in leadi...
What is the Fahrenheit equivalent of 600°C?
What are the essential components required for photosynthesis?
Which principle does a washing machine operate on?
Choose the correct statements regarding the process of photosynthesis.
Number of bones in adult human body are?
Which is used as red pigment in making batteries, lead glass and rust proof primer paints?
What was the original name given to the planet Uranus?
Relevant for Exams:
