Question

Three pumps of the same capacity can fill a swimming pool in 15 hours. How long will it take for 5 pumps of the same capacity to fill the pool

Answer 1

3/5=y/15
5/y=45y
y=45/5
9 hours

Answer 2

Answer:

Let x be the time taken for 5 pumps

Product of extremes = product of means

3:5= 15:X

3÷5 = X÷15

45 = 5X

45÷5 = X

X = 9 hrs