Question

20 pumps can empty a reservoir in 12 hours in how many hours can 45 such pumps do the same work ​

Answer 1

•If 20 pumps take 12 hrs to empty a reservoir
•Then 10 pumps would take 24 hrs to empty the same reservoir (As we reduce half amount of given pumps then time will be doubled to do the same work)
•And 1 pump would take 240 hrs to do the same job
• 45 pumps would take 240/45= 5.3333 hrs

Answer 2

answer is

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