Question

3) An old pump can fill a swimming pool in 9

hours. If a new pump was being used with the old
pump they could fill the pool in 3 hours. How
long would it take to fill the pool with just the new
pump?
clear
worl
long
5.
r

Answer 1

6 hours

Explanation:

old = 9

old + new = 3

3 - new = old

3 - new = 9

9 - 3 = new

new = 6