Question

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One pump can fill a tank of water in 5 hours. A second tank can fill the same tank in 4 hours. If both pumps are used together, how long will it take to fill the tank?
5/4 hours
9/20 hours
20/9 hours
4/5 hours

Answer 1

20/9

Explanation:

u gotta pay more attention in class this was an easy question

Answer 2

20/9

Explanation:

5+4=9

4×5=20

I think. I'm a little rusty. hope this helps