Inlet and outlet

The pool has a capacity of 50 hl. The inlet pipe flows in 1 minute 1.25 hl, and the waste pipe outlet drains the full pool in 50 minutes. How long will it take to empty the entire pool when both the inlet and outlet are opened simultaneously?

Correct answer:

t =  200 min

Step-by-step explanation:

V=50 hl v1=1.25 hl/min v2=V/50=50/50=1 hl/min  t=V/(v1v2)=50/(1.251)=200 min

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