Two pipes

One pipe fill one-fifth volume 20 minutes before by second one. The two pipes together will fill the tank in two hours. How long is will fill tank each pipe separately?

Correct answer:

a =  200 min
b =  300 min

Step-by-step explanation:

Our quadratic equation calculator calculates it.

b=(a+t1 5)=(200+20 5)=300 min

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