Fire tank

Whole fire tank was discharged once in 5 days by first out by second in $n days. Once firefighters pumped out 6/13 of water out from the tank and then let the water flow out both drain.

How long take empty the tank?

Correct result:

t =  1.01 d

Solution:

t(15+13)=1613  t=161315+13 t=1.01 d



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