Question
Pipe ‘A’ can fill a tank in 15 hours whereas leak
‘A’ can empty it in 45 hours. If they both operate along with pipe ‘B’, then the given tank gets filled in 9 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 45 litres {LCM (15 and 45)} Efficiency of pipe ‘A’ = 45 ÷ 15 = 3 litres/hour Efficiency of leak ‘A’ = 45 ÷ 45 = 1 litres/hour Combined efficiency of pipe ‘A’ and leak ‘A’ = 3 – 1 = 2 litre/hour Combined efficiency of pipe ‘A’, ‘B’ and leak ‘A’ = 45 ÷ 9 = 5 units/hour Efficiency of pipe ‘B’ = 5 – 2 = 3 units/hour Time taken by pipe ‘B’ and leak ‘A’ to fill the tank = 45 ÷ (3 – 1) = 22.5 hours
Which one of the following is not a part of nerves?
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be -
What is the name of the protein digesting enzyme released by the gastric glands?
A black body at temperature 500 K emits radiation. If its temperature is doubled, by what factor does its emitted power increase?
Which vitamin helps in improving night vision?
Group number and valency have no relation in
When a metal reacts with dilute hydrochloric acid, it produces:
Which of the following disease affects the brain of a person?
What is the focal length of a double convex lens for which the radius of curvature of each surface is 30 cm and the refractive index of glass is 2.50 ?
What happens to the gravitational force between two objects if the distance between them is doubled ?
Relevant for Exams:
