Question
Pipe ‘A’ and pipe ‘B’ can fill a cistern in 10
minutes and 12 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 = 60 units Then, efficiency of pipe ‘A’ = 60/10 = 6 units/minute Efficiency of pipe ‘B’ = 60/12 = 5 units/minute Efficiency of pipe ‘C’ = 60/12 = 5 units/minute So, combined efficiency of pipes ‘A’, ‘B’ and ‘C’ = 6 + 5 – 5 = 6 units/minute 50% of the cistern’s capacity = 30 units Therefore, time taken by all 3 pipes together to fill 50% of the cistern = 30/6 = 5 minutes
Which mineral is most abundant in the Earth’s crust?
Which content in phosphatic fertilizers required for grade?
…………. are formed from deposits of pre-existing rocks or pieces of once-living organism that accumulate on the Earth's surface.
Isobars are:
Given below are two statements:
Statement I: Orobanche (Broomrape) is a total-root parasitic weed in rapeseed mustard.
Statement II: Strig...
Which plough helps cutting of creeping or spreading grass and inversion?
Which one is cole-crop:Â
A soil has BD 1.35 Mg/mᶾ  and moisture content on weight basis is 10%. Find out moisture content on volume basis.
The scientist who initiated cloud seeding experiments using silver iodide was
Which of the following scientists are credited with the discovery and understanding of the excretory role of Malpighian tubules in insects?
Relevant for Exams:
