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?

Result

a =  300 min
b =  200 min

Solution:

a=300=300  min a=300 = 300 \ \text { min }
b=200=200  min b=200 = 200 \ \text { min }







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