Question

The doe family is ready to fill their new swimming pool . It can be filled in 12 hours if they use their own water hose , and in 30 hours if they use mr.Jones their neighbor’s water hose . How long will the Doe’s take to fill their pool if the neighbors hose isn’t along with their own ?

Answer 1

the time taken by both pool (simultaneously) = x

So, 1/x = 1/12 + 1/20

1/x = 5 + 3/60

1/x = 8/60

1/x = 2/15

x = 15/2

x = 7.5

In short, Your Answer would be 7.5 Hours