Question

28 pumps can empty a reservoir in 18 hours. In how many hours can 42 such pumps do the same work. ​

Answer 1

Answer:

12 hours

Step-by-step explanation:

28 pumps take 18h

42pumps take _h

Let the no. of hours be x

More the number of pumps, less the time so indirect proportion

Hence, 28*18 = 42*x

=> x = (28*18)/42 = 12

Therefore, it takes 12 hours for 42 pumps to empty the reservoir

Answer 2

42 pumps can do the same work in 12 hours.