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
Agricultural economists which are involved in price determination & market channels are known as………………….
A market in which the purchase and sale of a commodity takes place at time ‘t’ but the exchange of commodity takes place on some specified date in f...
What is the objective of puddling in rice?
The enzyme involved in gene regulation that catalyses the breakdown of lactose  into  glucose and galactose in prokaryotes is
Trashing, Arrowing and Ratooning are common practices in
During germination radical and plumule develop from?
Aphid is responsible for which disease in tobacco
A _______mutation originates during meiosis while a _______ mutation originates during mitosis.
Which type of seed production involves controlled pollination?
The indicator plant used for citrus greening is