Simultaneously 3316

We would fill the water tank with one inlet in 36 minutes and the other in 45 minutes. How long will it take to fill the tank if water flows through the first inlet for 9 minutes and then both simultaneously?

Correct answer:

t =  24 min

Step-by-step explanation:


1/36·t+1/45·(t-9)=1

9t = 216


t = 216/9 = 24

t = 24

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