Question

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

Answer 1

Answer:

5.33 hours.

Step-by-step explanation:

20 pumps can empty a reservoir in 12 hours

If there is more pumps so, it will take less time to empty the reservoir

So, there is inverse relation

20 pumps can empty a  reservoir in 12 hours

1 pumps can empty a  reservoir in  hours =$20 \times 12$

So, 45 pumps can empty a  reservoir = $\frac{20 \times 12}{45}$

                                                             = 5.33

So, 45 such pumps can do the same work in 5.33 hours.

Answer 2

it is inverse proportion