Question

21 pumps can empty a water take in 36 hours . how many hours would 56 pumps take to do the same work .​

Answer 1

Answer:

13.5 hrs...

Step-by-step explanation:

21 pumps can empty a tank in 36 hrs.....

So, 1 pump can empty it in 21*36 hrs.....

Therefore, 56 pumps will take 21*36/56 hrs = 13.5 hrs.......